I think I might just wait till they release a powered B unit. Did not really want to spend another $500 but might be the easiest route.
I do have some spare Weaver drives and different gear ratio towers; just need to gear the axles.
But then I need the TMCC system to match.
The A as noted is really heavy no need for more weight 4 traction tires 2 each on front and rear axle.
It is just the cars are very well detailed and heavy.
Will post some pics.
Click on photos for a larger view.
Running around the ceiling loop.
Have the MTH GP7 in consist to get it to pull.
Mostly 0-120 curves.