During a visit to Yorkshire a few hours were spent at Leeds BR station. The year was probably 1989.
As it happenned things were particularly interesting. DMU failures were clearly causing a problem and as a result 
locos...such as 31171 in Railfrieght Grey...were brought in to haul them.
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com