(05 Oct 2021, 8:15 pm)streetdeckfan wrote Tbh, they probably don't even hear it anymore.

After years of using the X21 regularly, which has what, 70 odd stops, I often forget she's even there!

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I am probably the same, I hear it a few times, and just drown it out now that I think about it, but on some buses it is especially loud, some buses you have to try to hear it as the engine is too loud, or the bus is shaking.