You tend to forget the origins of phrases like this. William and I had a reminder this morning, while visiting Toddington Station and the Gloucestershire and Warwickshire Railway. From the window of the old carriage that serves as a museum, I photographed a volunteer bending his back to shovel the coal into the firebox of this '28xx' class heavy freight locomotive, built in 1905. Rescued from the scrapyard, it has been lovingly restored over a period of 29 years. Besides eating up coal, it needs 3,500 gallons of water to fill its tank.