If all else fails you might consider getting a scale model from a hobby store, or a garage sale.
I just found a long forgotten bonus box in my storage with a few N-guage railroad cars and a diesel loco. The couplers are way overscale but the other dimensions and details look pretty close.
I'm going to set up my digital camera with a tripod and take some reference pics to import into my modeling program. I've modeled sections of track from real-world photos. I wouldn't model track using most model railroad track as a reference, unless it's "fine scale".