A large fleet of 555 JNA bogie ballast wagons was built by Astro Vagone (part of the Trinity group) in Romania and was principally designed to carry ballast and spoil. The design incorporated a large reinforced door in the centre bay to aid inspection, discharge and cleaning. The fleet came into service in 2004 and are now a common site nationally in their distinctive yellow engineers livery of Network Rail. They commonly operate in rakes of five and have been given the nickname Falcon.
The Dapol JNA model has the following features: