This installation is for the N Scale Life-Like GP60 uses a TCS L1D4 Decoder and was performed by TCS
First remove the shell by rocking it from the front to the back until it slips off the frame.
Now you should be presented with a chassis and lighting board as seen above. Next, slide the lighting board towards the back of the chassis and then lift it up and out.
With the lighting board removed the chassis should look like the image below.
Taking care to cover the motor tabs (as highlighted above in red) on either side of the frame with the phosphor-bronze legs of the decoder, place the decoder in the frame and slide it forward.
The chassis with the decoder installed should look like the image below.
Now replace the shell and you are ready to run!