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WATCH: Class 37 locomotive 37901 Mirrlees Pioneer returns to the mainline!

1.9K reactions · 50 shares | Arrived, safe and sound! 37218 and 37901 escort 37003 into Loughborough Works We hope you enjoyed '03s forray onto the mainline today - We certainly did! Please do keep sharing your photos and videos of the move, as we'd love to see them! We will announce more details regarding the road move to Dereham once they are confirmed. - Video courtesy of Gavin Wolfenden | The Class 37 Locomotive Group | Facebook

Locomotive 37901 ‘Mirrlees Pioneer’ on the Severn Valley Railway during the Class 37 Gala Originally built as D6850 (later renumbered 37150), this locomotive is part of the long-serving Class 37 fleet constructed between 1960 and 1965. Out of 309 built, only four were later converted in 1986 to trial new technology for a proposed Class 38 — becoming 37901 to 37904. What makes 37901 truly unique is its Mirrlees Blackstone MB275T engine, fitted as part of that experimental programme. While the Cla