Hi all!
This has been driving me nuts for a couple of hours so I figured I would ask the experts. Could anyone tell me what is making the noise when the train is at idle in this scene from Butch Cassidy and the Sundance Kid?https://www.youtube.com/watch?v=AeATCwk5PTQ
it makes a distinctive rhythmic sound around once a second. Some research tells me that this could be the air pump/compressor. However I haven’t been able to find another steam locomotive that sounds like this at idle. Any help would be much appreciated, thank you!