Track Recording Trolly at Shildon NRM
BR DX 50002 Track Recording Trolley built 1957 By Matisa 
Other numbers it has carried during its life are DB 965310 
It is in not to bad of condition for being stored out in the open its is awaiting restoration and is currently owned by the National Railway Museum.
uk museum br engine locomotive nrm engineers shildon matisa flickrunitedaward