That's odd, I have no idea how that happened.
I used the F7 hotrod as the motor for it, there shouldn't be any problems.
Unless whoever did the code for the F7 hotrod messed up.
Or when they did up the F7 hotrod it was only to work w/ TRAINZ itself and not later versions of it.
It works just fine for me.
* SHRUGS *
Oh and it only works in DCC mode just so everyone knows.