Why does a travelling train make such a noise?

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paul.fr

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Why does a travelling train make such a noise?
« on: 23/04/2008 14:15:14 »
The train is travelling at a constant speed, yet the sound i hear is a stuttery chh chh chh...chh chh chh...chh chh chh...sound. Why is that?

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Offline neilep

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Why does a travelling train make such a noise?
« Reply #1 on: 23/04/2008 14:22:22 »
There's a man in the front who does that !....he goes chh chh chh into a microphone and this is sent to all cabins.

So, now you know !
Men are the same as women, just inside out !

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Offline DoctorBeaver

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Why does a travelling train make such a noise?
« Reply #2 on: 23/04/2008 22:47:05 »
Isn't that just the wheels going over joins in the track?
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lyner

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Why does a travelling train make such a noise?
« Reply #3 on: 23/04/2008 23:12:08 »
What is the frequency of the cha cha cha?
Continuous welded rail is pretty smooth and I seem to remember more of a ssshhhhh  sound but, if there are points near where you are listening you can get a ch each time a wheel goes over the join. Urban tracks tend to be full of points,