The Standard unit of currency in terms of "modern" FR Wagons, now well over 40 years old. 15 All-Steel Hudson open wagons were acquired from RAF Lichfield in 1963. They have drop side doors, which can be removed if required and the top end bulkhead can also be removed if required. The handbrake, acting on all four wheels is at the bottom end, where there is also a platform.
They are normally used to handle ballast and several form part of the Permanent Way Department train.
The couplings are pin-and-link with a central dumb buffing plate for attaching a coupling block.