Your universe must be awfully noisy. Look closely the next time you are near a train wheel (but please don’t put yourself in danger).
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BART, maybe? That always was an… unusual… characteristic (mis?)feature of the BART system.
Last I looked, though, BART was in the process of converting its fleet from a cylindrical to tapered wheel profile. See, f’rex:
Wired: THE FOUR-YEAR FIGHT TO MAKE SAN FRANCISCO’S SUBWAY STOP SCREAMING
Streetsblog: BART Makes Headway against Headache-Inducing Howl
Wheel-Rail Seminars: BART Wheel Profile Change - Wheel Rail Seminars [PDF]
(Good tech details for rail nerds.)
Or are you somewhere else?
(…and do your train wheels screech and howl?) (-:
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first off, this conical wheel design isn’t universal. Second, the slope of the wheel is on the order of 1:40 to 1:20
Third, this only works for gradually curving track
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I’m sure it’s been backed up to the cloud somewhere.
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Now that you mention it, a description of how coins go into the parking meter would be pretty interesting.
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I think it’s on github, actually.
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uhoh 
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Nice explanation, but a lot of trains can work without a rigid axels: Modern Trams use “free” wheels a lot as it allows lower floors and the high-speed TALGO trains have always had them for the same reason, the newer generation even “hanging” the wheels from the roof to let the train sway in the curves (look, ma, no active system that can go wrong, just reliable old physics):
how to prevent jumping out of tracks: connect the wheels otherwise, no rigid axle
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One other feature that Talgo offers is the ability to have cars automatically adjust gauge, so a train can run through between Spain (1668 mm gauge) and France (1435 mm standard gauge) without having to stop and have the bogies under the cars exchanged.
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But variable gauge isn’t unique to Talgo.
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