Santa Fe also had some locks that used a key that looked like it would open a vending machine--a very small key with a thin stamped-metal handle and a small hollow barrel edged with very small teeth. Both the key and the lock's keyhole seemed very delicate, and I never saw one that would actually unlock. Some years ago, an Amtrak "San Joaquin" went in the siding at Gregg, and was instructed to hand-throw their way out the west end. The switch had one of those locks; all four crew members had the key for it, but none of them could unlock it. They finally had to back out the east end, and when passing the west switch found a signal maintainer attacking the lock with a hammer and chisel, hopefully to discard and replace it.