My trolley layout uses ORR type (single point) transit turnouts and min radius curves of 6 1/8 inches. My magnificent new Peter Witt that I received for Christmas manages all left and right 6 1/8 curves with no difficulty and all left hand turnouts are no problem.
But with right hand turnouts, the lead truck refuses to track properly and proceeds straight through with the trailing truck following the diverging route to the right.
I temporarily weighted the front end with 1 1/4 oz, suspecting the lead truck was light, but that did not make any difference in tracking properly through right hand turnouts. 
All of my other trolleys have Bowser motive power and properly handle left / right and "Y" turnouts. I notice that the Bachmann wheel diameters and flange depths are smaller than the Bowser ones.
If the smaller Bachmann wheel / flange radii are the determining problem is there a solution - even if my beautiful model has to suffer having non-conforming wheel sets?

thanks
Scotiatram

The programming track on my trolley layout is set up using the overhead as one current feed and the two common rails as the other.
I have just purchased a magnificent Peter Witt trolley that functions well on DCC and overhead with the micro-switch set to "trolley", but I cannot access the decoder to program it.
My Digitrax unit gives the "nd" error when I try to access the streetcar's decoder even though all other units can be accessed.
Question(s): do I have to modify my programming procedure for this Bachmann unit to a two-rail system, and / or do I have to access the decoder with the micro-switch set to "track"?