LMS Jubilee 4-6-0 No 45566 Queensland recorded as inside Holbeck roundhouse in c1952. However I am not so sure - I thought Holbeck was taller and the construction with heavy girders does not quite look correct to me, on the other hand look at the photo of 45428 in 1967, perhaps there were two different construction heights in the double roundhouse?

Photo: K. Field / Rail Archive Stephenson