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'''BR Class 37 37688 Great Rocks''' is a diesel-electric locomotive which was on hire to the SVR between January 2018 and February 2020. The Class 37, also known as the English Electric Type 3, was a familiar sight on the British Rail network, in particular on InterCity services in East Anglia and Scotland. A summary of the Class 37 can be found on the [[37906BR Class 37 37308|37 308]] page. They were also used for many years on secondary and inter-regional services. The Class 37s are sometimes nicknamed "Tractors" after to the agricultural sound of the diesel engine<ref>Wikipedia</ref>.

The loco was constructed at English Electric's Vulcan Foundry (Works Number EE/VF3383/D849 of 1963) and entered service with BR as D6905 at Llandore on 5 November that year. Transfers followed to Cardiff Canton in 1967, Eastfield and Polmadie in 1968 and a return to Eastfield in 1972. In January 1973 the locomotive was re-numbered 37205 following the introduction of TOPS. It was further re-numbered 37688 in 1986 following rebuilding as a Class 37/6.<ref>[http://www.brdatabase.info/locoqry.php?action=locodata&type=D&id=6905&loco=6905 BR Database] (Retrieved 5 August 2019)</ref>.