This is a highly detailed model of a GWR "Coral A" plate glass wagon. Built in 1908, the purpose of these wagons was to carry large plates of glass. The two inner racks were adjustable to hold the load securely. As far as I know, only one of these wagons still exists today (in a sorry state at Didcot railway centre).
The model features working couplings and buffers and adjustable racks (with working catches).
Also included is a bonus length of track.
Software: Poser 7+