4F-050-006 O & K JHA (end hopper) Foster Yeoman 19307 EarlyThe O&K JHA hoppers were built by Orenstein & Koppel to coincide with the introduction of the Class 59s in the UK for aggregate haulage by Foster Yeoman. They remain in service to date with Mendip Rail Ltd. A rake of these wagons consist of two outer wagons and a number of inner wagons. The notable feature is that the two outer wagons have screw link couplings and buffers on the outer most edge of the train, whilst the connection between inner wagons