I really was not aware that there is an 03901, but all was revealed upon this visit. Originally delivered as D2128 in January 1960 from BR Swindon, and allocated to 83D Laira, it became 03128 in February 1974 and was withdrawn in July 1976 at Bristol. There then follows a long story of removing its Gardner engine for usage elsewhere, replacement for work in Belgium, and a return to the UK. Eventually it has joined the Andrew Briddon Collection, and now sports a 350 bhp Cummins engine, with hydraulic transmission, leading to the '03901' numbering. Further updates at Weekend Rails.
Leading a southbound train into Darley Dale.
A more detailed angle.
Two pictures on a run-around at Rowsley South.
