DPU is Distributed Power Unit.
TOFC is Trailers on Flat Car.
Some of them have resistors on the axles.
Yeah, I tried fixing that wobbling car but it either won't fix or I worked on the wrong car.
The tail end unit is supposed to have a rear facing light for safety. That is a feature that requires changing several CVs to accomplish.
Be sure to set CV31 and CV32 first. With this configuration, F0 will be your front headlight and F3 will be your rear headlight no matter which direction you are travelling. F7 will dim whichever headlight is currently turned on.
From time to time, I hear people brag about their empires that can do this or that with perfection and better than anyone else. Unfortunately, they never post videos or have anybody who can attest to their trump all feats.
Thank you for your comments. They are encouraging.