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Unusual sound on the 1972 stock

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Silent

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I was just on the bakerloo line first carriage. Every time the train was about to move it made some deep winding, loud sound. I haven’t heard the 1972 stock make this sound before. What might it be.

I’m just curious to what the sound was. I should’ve recorded it but forgot to.
 
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Dstock7080

Dstock7080

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Possibly the RPA Rotary Pneumatic Accelerator not engaging first notch and having to rotate again?
 
73Stock

73Stock

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Is that the same sound and jolt as on the 1973 stock when pulling away?
 
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Silent

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I haven’t heard the sound on a 1973 stock either. It was like something was winding to help the train to release.
 
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