Class 15

The British Rail Class 15 diesel locomotives, also known as the BTH Type 1, were designed by British Thomson-Houston, and built by the Yorkshire Engine Company and the Clayton Equipment Company, between 1957 and 1961. They were numbered D8200-D8243.undefined

Conversion
All but four had been broken up for scrap by the end of 1972. The four that survived were converted into non-powered electric train pre-heating units at Doncaster Works, these duties keeping the locomotives employed for another ten years or more, until they were again made redundant and withdrawn.