Bachmann do 44-0053 'Servicing Point as a start, as well as 44-126 'Single Road Servicing Shed' which is based on Peterborough loco inspection point very easily modelled. Just look on Flickr and the amount of different BR traction from the 70's to the 90's that was serviced there, from 08's, 31's, 37's, 40's, 44/45/46 'Peak's, 47's, 55 'Deltics' were regulars, but 56's, 58's and 60's were often seen in the 90's.