Ed, those are the Atlas viaducts, right? I don't know what part of Conrail you model (I'm assuming ex-PRR) and my knowledge on this isn't more than an inch deep, but weren't most PRR bridges more arched (like the Rockville Bridge) than semicircular? I know there's a prototype for everything and please don't think me criticizing you in any way. I'm just curious if the PRR favored one type over the other.