These two former Class 31 l locomotives were acquired by R&DD as test locomotives.
The first, no. 97203, was operated by the Railway Technical Centre, based at Derby. It was used to haul various test-trains operated by the centre. However, in 1987, the locomotive was written-off after having sustained fire damage.
Therefore, a replacement in the form of 97204 was converted. This later returned to normal traffic, as no. 31970. Both locomotives were painted in RTC's red/cream livery with a black bodyside band.
|97203 at Toton in May 1987
|97204 in the loop at the RTC
|At Liverpool Lime Street
|At Sheffield on 22nd August 1990
|At Gloucester Horton Road open day
|Re-numbered as 31970 and pictured at
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