LGB "Acela" series

LGB made various versions of the Acela trains, lettered as Amtrack:

They was available under various part numbers like 91950, 91953, 91954.

R.J. has a "DC Comics Super Heroes" version, #92950

R.J and I put a QSI in it, there is only one truck powered. The picture belows shows this motor block. There are 4 pins on this truck, the outer 2 are the motor leads, and the inner 2 are track pickups. See that they are jumpered?

All you need to do is un-jumper these, and run the 2 track pickups (inside 2) and the 2 motor leads (outside two) to the decoder.

Very simple wiring.