National Railway Museum

Freight power.

In these photos from 1990, a double-header of Class 37s prepares to haul a hefty consignment of wagons (most likely containing limestone) from Redmire Quarry in North Yorkshire. With a combined peak output of 3,500hp and 110,000lb-ft of torque, the 37s packed some serious grunt. Leading loco 37505 first operated in 1961.

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