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Pneumatic Doors

I’ve previously written about the imminent retirement of Hong Kong’s earliest and most common underground trains, colloquially called the “M-Trains".

They have some pretty old-school pneumatic doors and lately some YouTubers have caught them in a somewhat poor state of tune. The rather violent door slam is amusing as long as you don’t leave a finger or two between them:

As you might imagine, the pneumatic doors make a very distinct noise.

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