European Railroad Discussion > Unusual Sound In A Swiss Cab

Watching a cab ride video out of Olten, CH and noticed a sound much like the ticking of a kitchen timer. It would stop when the train stopped and it would resume once the wheels were turning. Does anyone know what this might be?  (No, the Swiss don't have to wind up their trains before they depart).

Vigilence device?

fredstout Wrote:
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> Watching a cab ride video out of Olten, CH and
> noticed a sound much like the ticking of a kitchen
> timer. It would stop when the train stopped and it
> would resume once the wheels were turning. Does
> anyone know what this might be?  (No, the Swiss
> don't have to wind up their trains before they
> depart).

I am not sure what the sound is but you hear it in older locomotives like the Ae 6/6, not in the next generation like the Re 4/4 II.

This is the sound of the speedometer. These are mechanical devices mesuring the number of revolution of the wheels per time unit The rotation is transfered by axis and joins to the tachometer. The ticking is from the clock built into the tachometer to measure time.

 



Edited 2 time(s). Last edit at 08/02/18 14:30 by rosenth.

Thanks, that is what I was guessing, but I didn't know for sure.