BR 901010 Weltrol MV
From SVR Wiki
This BRBritish Rail or British Railways Well Trolley (‘WeltrolTelegraphic code signifying a Well Trolley’) was built by Head, Wrightson in 1952. It has a 26ft wheelbase and a 40 ton capacity. It arrived on the SVRSevern Valley Railway in 1990, and is photographed at Bridgnorth.
Sources
Railway Heritage Register Wagon Survey (states build date as 1950, but works plate states 1952)
Links
BR 901010 on vintagecarriagestrust.org