D1048 "Western Lady" at Old Oak Common in July 1976. © Barry Lewis

The Class 52 was a large Type-4 diesel-hydraulic locomotive built for BR's Western Region. Each one received a two-word name, with the first being "Western", which led to their nickname. At the time of their construction in the 1960s, BR regions had a high degree of autonomy and were commissioning huge numbers of locomotives, with some being more experimental. It was theorised that the Westerns would be lighter, more powerful and cause less track wear than conventional locomotives, but they weren't without their issues. The main problem encountered with the class was a mismatch between the engine and transmission. However, the locomotives proved themselves in service and led a successful career prior to their early withdrawal in the 1970s, due to their non-standard design.

(Information provided by Wikipedia)

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