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
They’re [wheel tapping ](https://en.m.wikipedia.org/wiki/Wheeltapper). Basically hitting the wheels then listening to the sound it makes. It’s to check the wheels to make sure they aren’t damaged.
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