This illustration was inspired by 'Classic Trains', a TV series which was transmitted on Channel 4 in 1997. As the caption says, during an 8-hour journey (in this case, a freight service from Birmingham to Carlisle), the fireman (the fox in the foreground) would have to shovel a ton of coal every 40 miles (!) while the driver (the wolf in the background) just had his hand/paw on the regulator, sat back, and enjoyed himself! Is it any wonder that even in real life, you would have a fat driver but you never had a fat fireman?