Scenic express,24" long, bought 2 last week at LHS. Great product. plan to make a curved girder bridge, even though none exist on real railroads.
As a great modeler I know told me, "there's a prototype for just about anything you might see on a model railroad." There are actually two short curved girder bridges up in Northern Oregon (if I recall correctly) feeding a wye junction. From a load standpoint, I could see why it wouldn't be logical to make them curved for anything other than a short distance and broad radius. Here are aerials of the pair of bridges I saw on a trip to Vancouver (by train, of course)
Here's what they looked like at track level out the roomette window. Note that there's a support in the middle of the roadway.