Diesel locomotive number D1528 about to go through a washing plant at Stratford diesel maintenance depot, 25 August 1968. Locomotives were easier to clean at this time than they ever had been; they could be washed automatically and did not get too dirty. Steam locomotives however, which were being phased out in the 1960s, quickly got covered in the soot and ash from their coal fires. They needed cleaning far more frequently, which was hard and filthy work.
© National Railway Museum / Science & Society Picture Library -- All rights reserved