1336 Sherman Dr., Unit C
Longmont, CO 80501-6174
Phone: (303 772-1901
Fax: (303 532-2352
intermountain@intermountain-railway.com www.intermountain-railway.com
OPERATORS GUIDE
Default DCC Address for All Locomotives: 3 ( o leadi g zeros)
Decoder Reset: CV8 = 8
Thank you for your purchase of the InterMountain Railway Company GP10 locomotive. Your locomotive is equipped with either a
LokSound Select Sound decoder or a LokPilot non-sound decoder. Both utilize the 21-Pin MTC system. This guide directs you
through basic operational and decoder functions for DCC operation. More in-depth information is available on our website in the
regularly updated DCC Assistance section. Should you have any questions that are not answered in this guide or online, please
feel free to contact InterMountain at the contact information listed above.
Removi g a d Operati g your GP10 Locomotive
Your locomotive is attached to the black plastic packaging via two Phillips head screws below the fuel tank. Removal of these
screws can be done with a standard sized Phillips screwdriver.
We do not recommend operating your decoder equipped locomotive on analog DC track power. If you operate your locomotives on
DC only and do not want to purchase a DCC system, please contact us to obtain a 21-pin DC plug that will allow the locomotive to
operate properly with DC track power. Note that some lighting functions may not work correctly when the DC plug is used. If you
decide to convert to DCC later, you can easily do so.
DCC No -Sou d Decoder Operatio
The non-sound DCC equipped locomotive responds to address 3 (no leading zeros out of the box. Increase the speed on your
DCC throttle and the locomotive should move in the direction your throttle is set for. The locomotive lighting is controlled by
various function keys. Please see the table on the following page for the functions available in the non-sound decoder. Please
verify that all lighting and motion is working properly before making any programming changes to the decoder. If you should have
any issues, contact us.
DCC Sou d Decoder Operatio
The DCC sound equipped locomotive responds to address 3 (no leading zeros out of the box. Upon placing your
locomotive on the track, you will not hear any sound.
You must press the F8 fu ctio key i order to get the
locomotive's prime mover started
. As the prime mover is starting, your locomotive will not move even if you give it
a speed command. A prototype locomotive cannot move until it is fully started and your model simulates this! After the
prime mover settles into idle (20 seconds , you should be able to give it a speed command, hear the prime mover
throttle up, hear the brakes release and watch it slowly move. If you reduce the speed to 0, you should hear the brake
squeal as the locomotive comes to a stop. Press F8 again while the locomotive is in idle and the prime mover will shut-
down. You'll hear the spitter valve releasing air for 1 minute after shut-down. A prototype locomotive's horn and bell
can be operated when the prime mover is shut down as long as enough air is available. Your GP10 is no exception!
Please see the table on the following page for all of the lighting and sound functions available in the sound decoder.
The F8 function key operation can be changed to allow track power to start the prime mover by setting CV32 to 2
FIRST, and then CV419 to 32.
The 20 second start-up delay can be removed by simply changing CV124 to 0. This will allow the locomotive to start
moving immediately when the throttle is increased during the start-up sound sequence.
Sou d a d No -Sou d Decoder Exte ded Addressi g:
After you have verified that your locomotive operates properly on address 3, you'll want to give it an address other
than 3. Today's DCC Systems give you the option to enter a 3 or 4 Digit Extended (long Address. This is usually the
cab number of the locomotive. Any address from 128 and above is considered by most DCC systems as a long address.
If you want an address between 1-127, set it as a short address. Refer to your DCC System's manual for step-by-step
guidance as to how to do this. Once you have set the new address, verify that all lighting and motion works properly
before proceeding to any other programming.
Full Throttle Features – Sou d U its O ly
Function 9 activates
Drive Hold
, allowing you to throttle the prime mover sound up or down while your locomotive
maintains a constant speed. This helps to simulate pulling heavy “loaded” cars working independent of BEMF which can
only adjust the prime mover sound based on how heavy the model train actually is, not by what is “loaded” in the cars.
Function 10 activates the
I depe de t Brake
. Just be sure to release the brakes before you try to move again!!
Ru 8
and
Coast
are also included in the decoder but are not mapped to a function key. Visit our website's DCC
Assistance section for more information on mapping Run 8 and Coast.
For more information about all of the FULL THROTTLE features visit: http://intermountain-railway.com/fullthrottle.html
HO-GP10-Locomotive-Insert-March-2017.odt
