The book features steam locomotives trundling along branch lines all around the county and travelling at speed on main lines in Yorkshire from the late 1940s to the early 1970s. Thus it covers the first years of British Railways and the last workings of steam in colliery yards. - Featured in pin sharp B/W photographs are steam locomotives working on the East Coast Main Line from Bawtry in the south to Northallerton in the northern part of the county. - Many of the county's major towns and cities are featured. - A wide range of locomotive classes are present from Gresley's A4s to BR Standard engines. - There are a number of close-up, colour photographs of main line locomotives on shed and works. - A selection of images are from archives hitherto unseen before. - Captions are informative and provide interesting details.