MTHTrains RAILKING GS-4 Quick start guide

M.T.H. HO 4-8-4 GS-4/GS-6
Steam Engine
Congratulations! You've just purchased the most
feature rich and technically advanced HO steam
engine ever produced! In addition, it happens to
be produced by MTH, the leader in digital sound
and control technology for model railroading.
There will be many more engines to follow.
We hope you will enjoy them.
Now, let's get started….. Freight Yard Sound
PLEASE READ BEFORE USE AND SAVE
(PS3)
ENGINEER’S GUIDE
Passenger Station Announcement
33
A
R
D
O
B
H
N
O
O
S
M
Y
S
E
T

M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
2
TABLE OF CONTENTS
UNPACKING YOUR ENGINE 4
Removing and Unwrapping Your Engine 4
What Else is in the Box? 4
PRODUCT OVERVIEW 5
Getting to Know Your Engine 5
Engine Diagram 7
SET-UP 8
Engine and Tender Connection 8
Smoke Unit Preparation and Use 8
Removal/Installation of Drive Wheel Sets 8
Lubrication 10
FEATURES AND OPERATION 11
Analog DC (standard DC power pack) 11
DCC Digital Command Control 14
DCS Digital Command System 20
SPECIFICATIONS 22
CARE AND MAINTENANCE 23
Troubleshooting Guide 23
CAUTION: ELECTRICALLY OPERATED PRODUCT:
Not recommended for children under 10 years of age. M.T.H. recommends adult supervision with children ages 10 - 16.
As with all electric products, precautions should be observed during handling and use to reduce the risk of electric shock.
WARNING: When using electrical products, basic safety precautions should be observed, including the following:
Read this manual thoroughly before using this device.
lM.T.H. recommends that all users and persons supervising use examine the hobby transformer and other electronic equipment
periodically for conditions that may result in the risk of fire, electric shock, or injury to persons, such as damage to the primary cord,
plug blades, housing, output jacks or other parts. In the event such conditions exist, the train set should not be used until properly
repaired.
lDo not operate your layout unattended. Obstructed accessories or stalled trains may overheat, resulting in damage to your layout.
lThis train set is intended for indoor use. Do not use if water is present. Serious injury or fatality may result.
lDo not operate the hobby transformer with damaged cord, plug, switches, buttons or case.
lWhen operating this product with older transformers that fail to meet current U.L. standards, install some sort of circuit breaker
protection between the transformer the DCS Track Interface Unit (TIU). Failure to provide this protection could lead to fatal damage
to the DCS equipment. See the warnings later in the manual.
This product may be protected by one or more of the following patents: 6,019,289; 6,280,278;
6,281,606; 6,291,263; 6,457,681; 6,491,263; 6,604,641; 6,619,594; 6,624,537; 6,655,640.
©2008, M.T.H. Electric Trains, Columbia, MD 21046

M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
3
QUICK START GUIDE
Of course, you should read your manual over before running your GS-4/6.
But if you just can’t wait, choose how you want to run below and enjoy!!
Now, after a few minutes, shut her down and read through your engineer’s
guide.
I USE A REGULAR DC SUPPLY…
Step 1: Unpack your GS-4/6 (refer to unpacking instructions on pg 4)…
Step 2: Set the engine on the track …
Step 3: Apply increasing DC voltage until she starts up and pulls out!
I'M A DCC OPERATOR….
Step 1: Unpack your GS-4/6 (refer to unpacking instructions on pg 4)…
Step 2: Set the engine on the track …
Step 3: Power up your DCC system…
Step 4: Select engine address 3 and press “F3” to start her up…
Step 5: Turn the throttle and head on down the pike…
I RUN DCS….
Step 1: Unpack your GS-4/6 (refer to unpacking instructions on pg 4)…
Step 2: Set the engine on the track …
Step 3: Power up your DCS system…
Step 4: Add the engine to your system and start her up…
Step 5: Turn the throttle and move out….
CAUTION: M.T.H. HO engines DO NOT OPERATE ON AC VOLTAGE.
Applying AC power to your locomotive could cause permanent damage and will
void your warranty.

UNPACKING YOUR ENGINE
Removing and Unwrapping Your Engine
Carefully remove and unwrap the model on a soft surface. By nature, models with
high levels of detail have some small fragile parts.
Carefully remove any foam packing pieces that may be surrounding the model.
What Else is in the Box?
The following items are packed with your engine.
Engineer's Guide (1)
You probably know that since you're reading it.
Smoke Fluid Pipette (1)
Enough fluid to get you started and then some.
Rear Drive Wheel Set without Traction Tires (1)
For Those who prefer not to use traction tires.
3mm Nut Driver (1)
In case you want to install the drivers with traction tires or replace the standard
drive wheels.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
4

PRODUCT OVERVIEW
Getting to Know Your M.T.H. HO Locomotive
Key Features
Your new HO GS-4/6 is equipped with the exclusive M.T.H. Proto-Sound®
3.0digital sound and control system. In plain English, this means your locomotive
contains state-of-the-art electronics providing realistic digital sounds, puffing smoke
perfectly synchronized with chuffing sounds and motion, precisely controlled speed
in increments of 1 scale mile per hour, and much, much, more.
Compatibility
The Proto-Sound 3 system is universally compatible with track power and/or signal
combinations including analog DC (regular DC transformer), DCC (NMRA Digital
Command Control), or DCS (MTH Digital Command System). Simply set your
GS-4/6 on the rails, apply any one of these power/signal sources, and move out!
The Proto-Sound 3.0 system automatically senses the track environment and adapts
accordingly. No hidden jumpers, switches, magic wands, or programming required!!!
A vast array of realistic operation is automatic when the GS-4/6 is run on analog
DC. You can expand access to features in a DCC environment. Experience the
most your new locomotive has to offer in the simple to use yet powerful world of
DCS. To be clear, DCS is NOT a proprietary version of DCC, as some other
manufacturers offer. DCS is a comprehensive layout control system designed
with one primary goal: make model trains do amazingly realistic things
using a simple and intuitive controller. We put the complexity on the inside,
and the fun in your hands!
Digital Sound
Your Proto-Sound 3 (PS 3) equipped GS-4/6 contains over 100 individual
recordings. These recordings are played back dynamically at appropriate times to
create a symphony of realism for your ears. Hear the chuffs automatically intensify
or lighten when speeding up or slowing down, listen to the sounds of brakes
squeaking and squealing as you come to a stop, or enjoy the random conversations
of railmen working as your model sits at idle. It's all there and it's incredible.
Now, your HO GS-4/6 includes the ultimate in realism Proto-Whistle. With this
incredible new feature you have variable control over the steam whistle sound in
your locomotive (when operated in DCS mode with the DCS Commander or DCS
software version 4.0 or greater) Also included is a Grade Crossing Whistle
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
5

Digital Control
In standard analog DC mode, your model still operates under digital control. The
PS 3 advance speed control system converts track voltage into digital speed
commands. Your model will run smoothly and consistently at any speed regardless
of load, hills, or curves. If you are a DCC user, you'll quickly learn to appreciate the
precision of our speed control and linear speed curve. DCS users will enjoy the
added benefits of controlling speeds in increments of 1 scale mile per hour
displayed on DCS controllers or easily changing acceleration and deceleration rates
independently without any discussion of bits or bytes. To be clear, DCS is NOT
DCC.
Lights & Smoke
As you read on, you'll notice there are no instructions for replacing light bulbs in
your GS-4/6. That's because there aren't any. We use specially designed and
controlled LEDs to create realistic lighting effects that occur automatically. Again,
NO PROGRAMMING!! Just come to a stop and watch as the headlight dims
automatically in accordance with rule 17. Of course, as you pull away, the headlight
returns to it's fully bright, yet warm, glow. Your new GS-4/6 includes realistic
Classification lighting with appropriately colored LED's in the boiler. We even
included a light in the cab so the engineer and fireman can see to do their jobs!
MTH is renowned for our realistic smoke systems. The HO GS-4/6 is no
exception. When the smoke is on, you will experience copious puffs synchronized
precisely with chuffing sounds at 4 times per revolution of the drive wheels. Of
course, when you stop, the smoke wafts out of the stack steadily, just like the real
thing! The smoke behavior applies to all operating modes, analog DC, DCC, or
DCS. With some DCC controllers, you can turn smoke on and off remotely. In
DCS mode, you can not only toggle smoke on and off with the press of single
button, you can actually select from 3 output levels to keep those smoke alarms
from going off!
More…
In analog DC operation, just flip the track polarity or direction switch at any speed
and watch your GS-4/6 gradually come to stop, turn on the appropriate directional
lighting, and smoothly accelerate back up to speed. No other HO locomotive has
features like these. There are so many more things to learn and enjoy about the
GS-4/6, we could write a book. But, that's no fun. So, if you haven't already done
so, flip to the Quick Start Guide and let's run your new engine!!
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
6

ENGINE DIAGRAM
Boiler
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
7
Tender
Drive Wheels
Cab Interior
Light
Fireman/
Engineer
Figures
Lighted
Classification
Lights
Front Coupler
Sliding Roof Vent
Pilot Truck
Smoke Stack
Drawbar
Drawbar Receiver
Rear Coupler
Apron
Drive Wheels

SET-UP
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
8
Connection of the Engine and Tender
Your MTH HO GS-4/6 is presented and packaged as a pre-connected unit.
The drawbar is attached to the engine and the tender by screws. Along with
providing a mechanical connection of the tender to the engine, the drawbar also
provide an electrical connection between the engine and tender.
No assembly is required.
Smoke Unit Preparation and Use
Your GS-4/6 is equipped with a proven fan-driven smoke system design featured in
MTH products for over 10 years. The performance and realism of this system is
unparallel in the model train industry.
Your smoke unit comes primed from the factory however, before running the smoke
unit for more than a few minutes, you should add more fluid. Add between 10-15
drops initially and whenever smoke output diminishes or if the engine has been
stored for a long period of time. We provided some fluid with your model to get
you started.
The smoke unit is controlled differently depending upon how your run your engine
so, for particulars on turning it on or off or setting the output levels, check out the
features and operation section.
You shouldn't run your smoke unit without fluid. Doing so can cause overheating
and reduce the performance and/or life of the unit. Of course, we recommend
using only MTH ProtoSmoke fluid. Super Smoke and LVTS brands also work fine.
Removal/Installation of Drive Wheel Sets
Your Gs4/Gs6 comes from the factory with traction tire equipped drive wheels
installed and an alternate set without traction tires available separately in the box.
The traction tires provide exceptional pulling power on grades and through curves
but should you prefer the traditional appearance of steel drive wheels, the alternate
set can be easily installed by
following the steps below.
First, position the engine upside
down in a foam cradle or other
soft surface. Using the 3mm nut
driver tool we provided in the
box, carefully remove the drive
rod screws (2) on the rear set of
drive wheels. There's one on
each side.

Next, remove brake shoe detail by gently prying and pulling up the part and set
aside. Remove the 5 screws holding down the rectangular chassis bottom cover.
Carefully remove the cover, set it aside and then stop. Don’t do anything further
until reading the next step completely.
Before proceeding, there are a couple of important things to know. First, under the
square bushings on each end of the axle are tiny springs. They are critical to the
proper operation of your engine and you don't want to drop them. Next, look
closely at the wheel set and bushings and take note of their orientation.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
9
Screws
Brake Shoe Lever & Bellcrank
Traction tire
Nontraction tire
Brake Shoe Detail/bottom plate
Brake Shoe Lever & Bellcrank
Driver springs

Now, very slowly and carefully lift the wheel set upward. Keep a close eye out for
the driver springs as they sometimes stick to the bushings and lift out. If you drop
one, you'll need some really good eyes or a magnet to find them. If they should lift
out with the wheel set, carefully set them back into cavities from which they came.
Drop the replacement wheel set into the chassis. Make sure the bushings are in the
correct orientation. The small rectangular tabs on the front and rear must be
upward (with the engine upside down) toward the chassis bottom cover.
Reinstall the chassis bottom cover with 5 screws, gently press the plastic molded
brake shoe detail back into place, and install the rear drive rod screws. See, you've
done it.
Lubrication
Using light machine
or household oil,
apply a very small
amount to all drive
rods, linkages, axles,
and other moving
parts as shown.
Your gearbox is properly greased at the factory and probably never needs service
however, if you run excessive hours pulling heavy loads, it's a good idea to remove
the 2 screws from the gearbox cover and re-grease using MTH gear grease or
equivalent.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
10
Lubricate Axles (L)
(L)
(L)
(L)
(L)
(LL)
Driver springs
Lubricate Side Rods and Linkage(Both Sides) (LL)
(L)
(L)
(LL)

FEATURES AND OPERATION
Now, for the fun stuff! Your new MTH HO GS-4/6 has more features and
operating capabilities than any HO engine ever built by any manufacturer. We're
going to walk you through everything she does in general but, you'll probably find a
few we forgot to mention on your own.
Modes of Operation
There are 3 modes of operation with different levels of features accessible in each.
We refer to them as analog DC, DCC, and DCS. Here's a little more explanation
before we get into the features of each mode.
Analog DC
This is when there is nothing connected to the rails except a conventional DC
power pack. These power packs generally have at least one variable output
controlled by a throttle of some sort and a means of reversing DC polarity on the
track to change the direction of your engine.
DCC or Digital Command Control
DCC is a popular digital command control scheme wherein the track power is also a
digital control signal. That is, using a DCC controller, you can communicate with
multiple engines and have them all moving at different speeds or moving in opposite
directions on the same track at the same time. The power/command signal remains
constant and engines are “commanded” to perform as desired. MTH is new to
DCC but, we recognize it's importance to many HO operators. So, we loaded our
engine with more DCC features easily accessible to the operator than any HO
engine ever built previously. You DCC guys are in for a real treat!
DCS or Digital Control System
While the acronyms are close, this is about where the similarities between DCS and
DCC end. Yes, they are both digital control systems however, MTH DCS is NOT
DCC. There are several proprietary versions of DCC on the market but friend, this
is NOT one of them. MTH's DCS system is proven technology in the O and One
gauge markets and now, we've brought its power and simplicity it to you.
First, the power signal in DCS is NOT the command signal. Next, DCS employs a
fully functional bi-directional communication scheme opening a vast range of
advanced features and yet, is so simple and intuitive, you can enjoy them! No
programming tracks, bits and bytes, or conversion of binary to hexadecimal
numbers here! To add an engine in DCS, just press “ADD ENGINE.” After that,
If you want to start your engine, just press “START UP” or, to turn the smoke on
or off, just press “SMOKE.” No combinations of letters or numbers to remember!
We think you're really going to like this!
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
11

Analog DC
Not much explanation is required here, and that's exactly why you run your trains
this way! Here's the good news, even if you like to keep it simple, your MTH HO
engine is packed with cool sounds, sights, and smells yes, smells, that you're going to
love.
Running the Engine
Set the engine on the rails, and apply DC power. Refer to the Set-Up section of this
guide for instructions on how to connect the boiler and tender.
As you increase power, at about 6 volts, the lights and sounds will come on. If you
continue to increase power, and the smoke switch is on, the smoke unit will kick in
at about 7 volts. More on the smoke further down. Keep going on up to about 8
and she'll move out! About 16 volts DC is adequate for prototypical speeds
however, your engine can handle up to 24 volts DC if you feel the need for speed!
Changing Direction
If you flip the direction (polarity) switch on your power pack while the engine is
moving, it will gradually slow to a stop, and slowly accelerate back up to speed in the
opposite direction. This is an exclusive feature of MTH engines that we're sure
you'll enjoy. You can also change direction the old fashioned way by reducing
throttle until the engine stops, flip the direction switch, and then increase throttle
again. Either way is OK, we just thought a graceful transition from any speed
would be cool.
If you switch track polarity too slowly, the engine may stop abruptly and not move
in the reverse direction. This is normal. There is a feature we call “anti-jack rabbit”
that prevents the engine from taking off at high speeds when high voltage is applied
to the track instantly. Some direction switches have a “dead” spot where the power
is completely off during polarity changes. This can invoke the anti-jack rabbit
feature. The solution is to flip the direction switch more quickly. Don't worry you
won't hurt the engine.
Speed Control
Your engine is equipped with speed control. This feature is always active, even in
analog DC mode. Basically, your engine constantly measures track voltage and
converts this to a digital speed command. You should notice the speed remains
constant up and down grades, around curves, and with varying loads. This is no
accident. You've got the most precise speed control system available today.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
12

Sounds
In this mode, sound are pretty much automatic. If you're moving, you'll hear
chuffing sounds. If you increase or decrease the throttle quickly, you'll hear labored
or drift chuffing, respectively. Of course, if the engine has been sitting for a while,
the engineer may open the steam cocks and release the moisture, don't worry, he
never forgets to close them.
When your sitting at idle, there may be some maintenance done. You could hear
someone dopping the siderods or checking the water level in the tender and
filling it if necessary. Don't worry, all of this and more is just a normal part of
everyday operations.
When your moving at a pretty good clip and you reduce the throttle quickly, you may
hear the brakes squeak and squeal as the engineer applies them. Of course, they'll
stop when the engine does.
If things get too noisy, just locate the sound volume pot under the coal on the
tender and adjust the volume from maximum down to off, whatever suits you. Turn
it counterclockwise to reduce the volume or clockwise to increase it.
When you turn the smoke on, just give it a few seconds to warm up. It doesn't start
instantly. Once you see smoke gently streaming out (or not if you prefer) snap the
coal detail back in place and away you go.
Once on, like the sounds, the behavior is fully automatic. The model will puff out
smoke in exact synchronization with the chuffing sounds and driver rotation at 4 per
revolution. Amazing!
When the output begins to diminish significantly, add 10-12 drops to recharge the
unit. Again, give it a few seconds to warm back up. The cool fluid slows the action
for a few seconds. Also, watch out for bubbles that may block the stack. You may
need to gently blow down the stack to clear it.
Lighting
Now, this is an illuminating section (we couldn't resist). Your model is equipped with
a headlight, backup light, cab interior light, number board lights and classification
lights. (GS-4 includes Mars light)
The first thing to know about the lighting is there aren't any bulbs. It's all LEDs so,
if you look for a section on how to replace them, you won't find it. You should
never have to.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
13
Volume control
Smoke Switch
Smoke
Running your smoke unit couldn't be
simpler. There is a switch hidden under
the coal on the tender. If this switch is
on, your smoke is on. If it is off, your
smoke is off

As with sounds and smoke, in analog DC mode, lighting operation is fully
automatic. They're always on and behave appropriately.
The headlight functions under rule 17 and dims when stopped for a time or while
backing up. Of course, just as you begin to move forward, it goes bright to show
the way.
The cab light is always on so the engineer and fireman can always see clearly!
The tender back-up light only illuminates when in reverse, even if you're not
moving. It goes off when in forward. This is really handy since you'll always know
which direction the model will move next.
DCC Digital Command Control
Now, if your operating in this mode, you may very well know more about DCC
than we do so, we're going to stick to telling you about our engine in this operating
environment. First of all, in DCC mode, we brought all the features of analog DC
along and of course, added to them. Your new engine has more user features than
any DCC engine ever built. Some of them are even ahead of the world of DCC!!
Running the Engine
Set the engine on the rails, and apply DCC power. Refer to the Set-Up section of
this guide for instructions on how to connect the boiler and tender.
The first thing you will notice is the engine does absolutely nothing! Don't panic.
This is by design. MTH HO engines never do anything in command mode until
told to do so, regardless of what brand DCC controller you use. In this way, you
could have a fleet of MTH HO engines on the rails and they will remain shutdown
until you command them to start up.
F3 Start up/Shut Down
Select engine address 3 (factory default), press the F3 (Start Up/Shut Down) key,
and your engine will start-up. Lights, sounds, smoke, ACTION!!! Roll the throttle
and away you go. Our models are compatible with 14, 28, and 128 speed steps. We
strongly recommend 128 because in this mode, speed steps correspond directly to
scale speeds. That is, speed step 10 = 10 smph, speed step 47 = 47 smph, etc. You
get the idea. When your done, press the F3 key again, your engine will shut down.
To be clear, pressing F3 when the engine is shut down will start it up. Pressing F3
when the engine is started up will shut it down. Pretty clever, eh?
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
14

Sounds
As in analog DC mode, the default sound arrangement is automatic. So, you can
just run your engine and its sounds will follow the action. But, you operate in DCC
for a reason. You want access to more features, right? Well, depending upon the
capabilities of your DCC controller, you now have access to a range of sound
features including bell, whistle, PFA, engine sounds on/off, master volume,
Doppler, and more.
Here's a brief description of commonly used sound features.
F1 Bell
Toggles bell sounds on/off. Listen to the last half ring of the bell when it stops!
F2 Whistle
Blows the whistle for as long as it's on. There are several different ending signatures
depending on how long you hold the button down. Check it out!
F4 PFA
PFA in MTH lingo stands for passenger and freight announcements. Since your
engine provides freight service, you'll hear freight yard sounds.. PFA is a very
popular sound feature that's a staple in almost all MTH products. We had to give
you this!
There are 4 sound sequences or segments in PFA. You advance through them at
your command. Each segment has a minimum time of ~10 seconds but more
sounds play the longer you listen.
When running the engine, simply press the F4 key to activate PFA. When you bring
the engine to a stop, the arrival sequence will play. You can remain in this segment
as long as you like.
Press F4 again, and advance to disembarking sequence. Again, you can listen to this
sequence as long as you like.
Press F4 again, and advance to the embarking sequence. Again, you can listen to
this sequence as long as you like.
Press F4 again, and advance to the departure sequence. After the engineer says
“Just keep the steam up” and the engine will automatically pull out and resume the
speed and direction of when you entered the feature. The bell ring for a short while
and then turn off automatically.
F6 Engine Sounds
Toggles engine sounds on/off. Think of this like a mute button. When the engine
sounds are off, you can still ring the bell or blow the whistle or run the engine, it just
helps if you have to answer the phone.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
15

F7 Master Volume
This command cycles through 9 volume settings from off to max. Each press
advances to the next cycle. Unlike the F6 engine sounds command, when the
master volume is set to off, no sounds can be heard.
If your DCC controller has more F functions, you can access even more features.
Check out the complete list in the chart at the end of this section.
Smoke
The smoke system in DCC mode operates exactly as it does in analog DC mode
with the added benefit of being able to turn it on or off remotely. Pressing F8 on
your DCC controller will toggle the smoke unit on and off again.
The manual smoke switch under the coal on the tender must be “on” for the F8 key
to function. When the smoke switch is off in DCC mode, the smoke is always off.
In the future, as DCC controllers expand to include more functions, you'll be able to
cycle through low, medium, and high output settings in DCC. Refer to the DCC
function chart for details.
Lighting
As with other feature categories, lighting in DCC mode operates just like analog DC
with regard to rule 17, constant brightness and directional behavior. See that section
for details. DCC provides some additional control to suit your preferences.
F0 Headlight
Toggles the headlight on/off.
F5 Cab Interior Light
Toggles all lighting on/off, including Marker LED's. When on, all lighting behaves
automatically as described elsewhere. When F5 is off, all lighting is off.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
16
Smoke switch

More DCC
Okay, we've walked you through the basic features and functions available in DCC
(F0..F8) but, there is much, much more. In fact, we've filled up functions F9
through F28. Some controllers are available today that provide easy access to F9
through F12 however, we don't know of any that allow you to press a button for
F13 through F28. When the DCC controllers expand to include these functions,
your MTH HO engine will be waiting. Here is a list of the F9 through F28
functions present in your engine with a brief description of how they work.
F9 Forward Signal Sound
Plays 2 short whistle toots to signal the engine is moving forward
F10 Reverse Signal Sound
Plays 3 short whistle toots to signal the engine is moving in reverse
F11 Coupler Slack Sound
When sitting still, arms the system to play the sound of coupler slack being pulled
out as the engine moves.
F12 Grade Crossing
F13 One-Shot Doppler on/off
Relative to speed, suppresses all engine sounds and then causes them to build in
volume and pitch to their full level and then reduce back down to off. A very cool
effect that is technically and mathematically correct. Oh, after the Doppler shift is
complete and sounds are off, press F12 to turn them on again.
F14 Extended Start UP
Plays a longer, more detailed and realistic start up sound sequence.
F15 Extended Shut Down
Plays a longer, more detailed and realistic shut down sound sequence.
F16 Labor Chuff
Plays deeper and sharper chuffing sounds to simulate a heavy load
F17 Drift Chuff
Plays softer and lighter chuffing sounds to simulate a light load
F18 Smoke Volume
Cycles smoke volume through min, med, and max output levels.
F19 Whistle Toot
Plays a single short whistle toot so you can make up your own signal patterns.
F20 Coupler Close
Plays the sound of 2 couplers crashing together and closing.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
17

F21 Feature Reset
Resets the engine back to factory defaults with the exception of the address.
F22..F24 Idle Sounds 1 - 4.
Plays what we call idle recipes 1 through 4. These sound sequences play randomly
when the engine is at idle but if you have these F functions, you can trigger them
whenever you like.
F25 Brake Sounds
Toggles brake sounds between auto and off. They are on by default but you can
turn them off.
F26 Cab Chatter
Toggles random voices between auto and off. They are on by default but you can
turn them off.
F27 Clickety-Clack
Toggles the sounds of sustained speed inside a passenger train between auto and
off. This sound is off by default but you can turn it on (auto). Once on, if you
maintain a steady speed of ~30 smph or higher for more than 30 seconds, the effect
automatically turns on.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
18

F0 Headlight on/off
F1 Bell on/off
F2 Whistle/Horn on/off
F3 Start-up/Shut-down
F4 PFA initiate and advance
F5 All Lighting on/off
F6 Engine Sounds on/off
F7 Volume low, med, high, off
F8 Smoke on/off
F9 Forward Signal Sound
F10 Reverse Signal Sound
F11 Coupler Slack Sound
F12 Grade Crossing
F13 One-Shot Doppler on/off
F14 Extended Start Up
F15 Extended Shut Down
F16 Labor Chuff
F17 Drift Chuff
F18 Smoke Volume low, med, high
F19 Single short whistle toot
F20 Coupler Close
F21 Feature Reset
F22 Idle Sequence 1
F23 Idle Sequence 2
F27 Idle Sequence 3
F25 Idle Sequence 4
F26 Brakes auto/off
F27 Cab Chatter auto/off
F28 Clickety-Clack auto/off
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
19
DCC “F” FUNCTION LIST
F Key Function
CV Description
1 Short Address 1-127
3 Acceleration Rate 4 smph/sec
4 Deceleration Rate 4 smph/sec
17 & 18 Extended Address (upper bits must be set to 1)
29 Bits 5 = ext. addr; bit 1 = speed/dir method
49 Short Address (controllers that prohibit addr POM)
50 & 51 Extended Address (controllers that prohibit addr POM)
55 Reset - send value = 55 to addr 55

DCS Digital Control System
As you may have gathered by now, DCS is an MTH exclusive Digital Control System
that provides easy access to dozens and dozens of features in our models. We
developed DCS to provide a powerful and advanced model train control system that
was simple and enjoyable to use. We've accomplished that goal. DCS further
expands the features available far beyond that of DCC. After all, in DCC, we only
had a limited number of “F” commands to fill.
As with DCC, we'll leave the detailed “how-to” system explanations to the DCS
system manuals. What you should know are all the cool features your engine has
built-in, waiting for you to experience.
Running the Engine
In DCS, you simply place your engine on the rails, press “ADD ENG” and the
system will scan the track and automatically upload your engine into the controller.
At this point, you can press “START UP”, roll the throttle and pull out! That's it!
Speed Control
DCS engines are controlled in scale miles per hour (smph) and increments of one.
So, that means if you dial up 10, you engine will smoothly accelerate to 10 smph.
There is no need to select a speed step setting, there's only one precise linear
control at scale speeds. See, powerful yet simple.
Sounds
Introducing the ultimate in prototypical operation Proto-Whistle. Your new GS-
4/6 includes this amazing feature. It allows you to adjust the pitch of the steam
whistle just like you were sitting the cab pulling the whistle rope yourself. This new
feature is controllable from either your DCS Commander or with your DCS system
with software version 4.0 or greater (see your DCS or DCS Commander instruction
manual for specifics on how to operate this feature)
GS-4/6
Independent Volume Settings
Using DCS, you independently adjust the bell, whistle, engine, and accent sounds
volume. This is like a mixer so you can set up the engine fit your specific tastes and
sense of realism. Oh, they all move relatively up or down with the master volume
settings.
Not only that but your also has a Grade Crossing Whistle Feature. So just
like the real engine, with the push of a single button, you can trigger the Grade
Crossing Whistle. To trigger the Grade Crossing Whistle press the A3 button on
your DCS Commander or the SXS softkey on your DCS Remote Handheld.
M.T.H. HO 4-8-4 GS-4/ GS-6 Steam Engine
20