Is the height from the railhead to the top of the truck bolster an industry standard? I am looking for that measurement for Walthers trucks (regular freight car trucks: solid, roller bearing; doesn't matter). Are walthers trucks interchangeable with Atlas or others? From my understanding, the Athearn trucks are a bit shorter, requiring washers when installing them on other cars.
I don't believe there is an industry standard and I haven't found two the same... My experience of Atlas is they are unique to their bolsters so making truck swaps is difficult. I ended up fitting a set of Walthers trucks to an E&C shops boxcar, as the previous owner had butchered them, it actually set the height spot on with no washers... I would always use measurments of the particular trucks you are going to use. ideally have the trucks to hand and build around them.