Hello, I have a new Bachmann Niagara (nice loco!) whose tender will not run on my layout due to its wheel arrangement.  I cannot modify the trackwork on the layout to accommodate it.  Instead I want to swap this (impossible) tender for a shorter one with normal trucks.  I purchased one on-line, Bachmann item number 89832, which Bachmann tells me is at least five years old and whose wiring is both unknown and incompatible with the Niagara.  When I plugged the replacement tender into the Niagara, incidentally, it ran perfectly but only backwards!  Also, the light on the loco did not light up.  I offer this info as clues.  Can anyone help me make this conversion or recommend a model train electronics shop that could do it. I am wondering whether the problem is that the wires in the harness from the replacement tender are attached to the four wire plug in a different order than they are in the harness from the Niagara's original tender.  Maybe it is that simple?  In any event, this is a bit over my head.  Any suggestions?  I am in Buffalo, NY, by the way.