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Reply to "Westbrook cars"

The cars will operate just fine on 3 rail track with the issues you noted.    Tubular would be very problematic unless the flanges are fairly large.   Modern track with flat top rail should be just fine.    As you mentioned sharper curves could cause problems.   If your curves are wide enough there should be no problem.    When you say 72 inch curves do you mean radius or diameter ie. 072 ir 72 inch radius?    In either case 40 ft prototype cars should be ok as long as there is some coupler swing.    Longer cars could become a problem, but I don't think Westbrook made any long cars.    The track gauge (distance between the rails) is the same in 2 rail and 3 rail.

2 rail cars in modern times have one wheel insulated.    That is not a problem.   These older cars may not have insulated wheels, but that is not a problem on 3 rail track either, most 3 cars do not have insulated wheels because one pickup is on the center rail, and the other is both outside rails.     In the 40s, a lot of fellows built layouts with "outside 3rd rail" basically similar to NYC subways.    They often bought uninsulated wheels.

Body mount couplers let cars track better if the curves can handle it.  

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