This installation is for N Scale Atlas 8-40CW and uses TCS AMD4 Decoder and was performed by A.G.

This is a fairly easy installation that requires some programming skills.



The upper three pictures show the Atlas 8-40CW with its shell on.


Gently remove the locomotive's shell starting from the cabin side as shown in the picture above.


This picture shows the locomotive's chassis with its shell taken off and the original light board.


This locomotive uses separate LEDs for ditch lights so a four function decoder is needed. A close-up picture of the ditch light board is shown in the picture above.


Gently unsnap the fuel tank as shown in the picture above, remove the light shield, and desolder the four ditch light wires (circled in red)


Here is a close-up picture of the desoldered ditch light wires.


Using philips screw driver loosen the rear and front screws (circled in red) without removing them. Using the flat head screw driver spread the chassis far enough apart to remove the original light board.


Place some solder on the four decoder's power pick-up tabs as shown in the picture above. The reason for doing it is to make sure there is proper contact / fit between the decoder and the chassis (see the step below)


Place the TCS AMD4 decoder so that two motor tabs (that are underneath of the decoder) are lined-up with motor pads of the decoder, and make sure there is a tight fit in all four (circled in red) connections. Tighten the front and the rear philips screw so that the chassis stays together.


Because of the fact that the LED pads are placed on the opposite end of the decoder, some wire extensions are needed.


Using the manual that came with the AMD4 decoder, solder the wires to the proper pads on the decoder.


Here is a picture of the installation prior to the final wire arrangement.


Here is a picture of the Atlas 8-40CW's chassis with the TCS AMD4 decoder installed and the light shielding placed. Put the shell back on being very careful not to break anything.


Because of the fact that ditch lights are being used some function remapping is needed. Function #1 is the green wire and function #2 is the purple wire. Before function remapping, the right ditch light lights constantly when function button one is pressed, and the left ditch light lights constantly when function button two is pressed. What we want to achieve here is that both ditch lights should be blinking when the locomotive is moving forward and should be activated with a press of one button.

Green wire (function 1) CV35 = 4

Purple wire (function 2) CV36 = 4

At this point both ditch lights will turn on with a push of a single button (function button 1) and will begin blinking with a push of function button 2

To make the ditch lights blink in the forward direction we need do the following:

CV51 = 10

CV52 = 11

Now the locomotive should be ready to go!



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