Prototype Unit
In addition to the 49 production units, a fiftieth two-car unit (cars 50000 and 56000) was built to test the Rolls Royce engine type and hydraulic transmission later used on the Class 127 units. Initially the unit underwent trials on the Cockermouth, Keswick and Penrith railway in early 1957, but was subsequently also allocated to Lincoln and worked the same diagrams as the other 49. The unit was withdrawn in October 1967 as it was deemed to be non-standard, thus never received an official TOPS class designation.
Read more about this topic: British Rail Class 114
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