There were 23 different diagrams in the AA-index of TOAD brakevans with variations omitted. This is one of them.
Photo texture from Chris Whiting who retains copyright. Couplings and wheels curtsey of Paul Hobb's Blender library.
You'll find this one under track. It has four levels of LOD, and is a pure scenery object so don't place it on a track you expect to run a train along.