In March of 1943, while in Fort Madison, Iowa, Jack Delano decided to visit the Santa Fe’s Shopton locomotive shops. He chanced upon a pair of boilermakers doing repairs inside of the firebox of a locomotive (yes, there are two men inside that cavern). It looks like they’re doing some welding repairs, something not uncommon in this environment.

It looks like that opening into the firebox is quite large, but in fact, it’s barely big enough for a man to squeeze through.