I started wiring this engine from scratch with a PS3 steam kit. I noticed that what I thought at a glance were grease tubes, are actually spring loaded power pick-up points to the engineer's side wheels. I guess I haven't been inside enough two rail MTH engines. 
Looks like what they use inside their diesel trucks.
I wire the three engineer's side wheels together, along with the trailing axles that pick up from the same side. I used an old black wire on the middle axle so don't let that confuse the power path. Other black wire goes to chassis for fireman's side power pick up.
The middle engineer's side wheel isn't working and I wonder if it has to seat itself yet? I will test again afterwards and see if there's something else wrong inside.
I had a power failure in a MTH Dreyfus engine that I had to add power pick ups to. It was only getting power from one side of the engine (chassis ground?)
I may go back inside and see if these paths aren't hooked up properly.
