Here's my latest model. A partially enclosed autorack. I don't think anyone has made one of these for the sim yet. There are many variants of these cars. I honestly have no clue as to what exactly this one is let alone if the car number is right...... It's been rather hard finding any detailed info on open autoracks. I designed it based of a MSTS SLI model from the Feather River Freight Set.
One slight problem with the blue print. Model didn't show up in the preview window. I don't think it's 100% aligned to the point or origin. I don't know why, but this happens to me almost every time on the first try with a new model. So a slight adjustment on the point of origin should fix it.
I'm not sure I'll make a rack with autos. First off is the polygon hit. Second, I can't design a auto if my life depended on it. 3D Warehouse is a option, but it would take a lot of milking it down to get to a accepted polygon count.
And I gather making a child object from shapes of autos from the sim won't work unless I have the source model and good luck on that if it's a commercial vender.