This installation is for N Scale Atlas SD50 and uses TCS ALD4 Decoder and was performed by TCS.

                 

Remove body shell and handrails by gently pulling up on the shell.  Remove the fuel tank.

Here is the picture of the Locomotive's chassis with its shell taken off and original light board installed.

Loose the two Phillips screws that hold the two halves of the frame together and remove Locomotive's both trucks by gentle pull and twist to the side. Pull two copper power lines from both side of the chassis.

Take both halves of the frame apart, remove original light board that the locomotive came with and insert the ALD4 decoder. Make sure the motor tabs are not touching the frame ( as shown in two pictures below) - isolate them with kapton tape and make sure they ARE touching their proper spots on the underside of the
decoder. ( See the picture at the very bottom )

 

Put both sides of the frame together and make sure that all four contacts (circled in red) are fitted into the chassis so that they create physical/electrical contact. Install both trucks, power pick-up rails , and tighten the two phillips screws on the chassis. Place the shell back and test your locomotive on the track.

 

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