British Rail Class 01
The British Rail Class 01 diesel locomotive is a short wheelbase 0-4-0 diesel-mechanical design intended for use in areas with tight curves and limited clearance.[2] The locomotives were very versatile, despite having only 153 horsepower (114 kW) available, and were small enough to operate on any railway on the BR standard gauge network, limited only by their low top speed of 14+1⁄4 miles per hour (22.9 km/h).Class 01 locomotives had a Gardner 6-cylinder in-line, 4-stroke 6L3 engine of 153 hp (114 kW) at 1,200 rpm connected to a Wilson SE4, 4-speed epicyclic gear box with a Vulcan-Sinclair type 23 rigid hydraulic coupling, and a Wiseman 15LGB reverse and final drive unit.Two pre-TOPS members survive in preservation: More recently, the sub-classification 01/5 has come into use to refer to small, privately owned shunters certified to run on the national network.As such, 01/5 is a collective grouping of a number of very different locomotives, having in common only that they are small, hitherto unclassified shunters of designs never given a BR classification.