Internal User Vehicles on Britain's Railways

Following on from their use in revenue earning service, many vehicles are put to use within the departmental operating fleet, often being rebuilt for a specific purpose. When their use has been deemed no longer necessary for the departmental service, several of these vehicles are then put into what is known as the 'Internal User' fleet, where they are used until either being scrapped or sold on to preservationists. These Internal User vehicles, once they have been allocated to a works/depot/yard etc, are not permitted to run anywhere on the mainline network and are solely confined to where they have been allocated. Once at their allocated location they quite often become static vehicles or even grounded bodies, and are used as store sheds, mobile workshops, fuelling tanks, generator vans and numerous other, sometimes one-off, uses.