Oh, and Trinity, Greenbrier, Railcar America, and others. The oil industry also purchases cars directly, as pointed out earlier by thackney. Tankcars and covered hoppers (for grain and dry commodities) are a really hot sought after item right now. The railroads went through a bad spell during the recession, and now we have to play catch up, and we have more work than we can handle right now.
Keystone XL won't pipeline the sand to the oilpatch.