I just picked up a book about American Car and Foundry by Signature Press...there is some really interesting information in there.
What do you mean the weight seems to be off? I personally do not run too many grain cars, but we are coming out with a cement car shortly.
Now if you have the dry and empty weights for a car (and we will assume that the car is capable of hauling 100t) and we add the specified amount of cargo the car is supposed to hold then we could deudce the proper weights. Or am I missing something here, this was never a real strong suit of mine in school.
What I do know how to do is calculate what is needed to upright a fully loaded cement truck (about 80,000#s) with enough snatch blocks and wire rope using a truck that has 2 - 4 ton winches (IMG:style_emoticons/default/cool.gif