Departmental vehicles, also called departmental wagons or engineering vehicles, are special vehicles used to support the engineering functions of the railway. Thus they serve the internal purposes of the railway company and are not used for general passenger or goods traffic.
Used for the transport of works material for the maintenance of railway facilities or wagons used for other internal purposes that have been converted or specially built. They usually travel in special work trains, frequently at low speeds. Only by exception, and under special measures, do they form part of standard goods train.
Commonly used as departmental vehicles are those wagons or coaches that, on account of their age and design, are no longer suited to or permitted to be used in normal service. Sometimes they are converted for specific roles. Certain departmental vehicles are built for a specific purpose e.g. the transport of ballast or as construction machines.
NVR Wagon Group 