Jim Stirniman,
Why do you think you have to change the trucks on the B&O car? The wheelsets appear to have 2 rail flanges and the apparent age of the car implies that they would be insulated. All the brass cars I am familiar with made from the early 60s on that came with trucks had 2-rail insulated wheelsets.
I think unless you plan Proto-48, the trucks/wheelsets on the car should be fine.