I feel like every time there’s a train in a movie, they show an engineer walking along the cars hitting each car’s undercarriage with a rod or hammer. I have also seen this in documentaries, so it’s not just Hollywood. What is the reason for this?
In: Other
[Whisked away to Bulgaria](https://www.youtube.com/watch?v=ycPEBwDm0GI) via the innerwebs, for a call and respond demonstration.
Great question OP.
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