D) BRITISH RAIL RESEARCH DEPT (RED/BLUE WITH WHITE LINING)

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Arguably the best-known Class 24, the former No. 24061 had a second life as motive power for Derby Railway Technical Centre’s test trains. It received its eye-catching red and blue livery and name in 1980.
Detail combination: Production body, Front end doors, Later exhaust, Boiler fitted, Exposed solebars, SKF axleboxes.
Running number: 97201 Experiment
Notes/Period: Widely-travelled throughout the 1980s, including numerous open day visits, before being preserved on the NYMR. Has been a popular subject before, but SLW will produce the most accurate model to date.