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Comment by brnt

1 day ago

Problem with rubber wheels in metros is absolutely atrocious air quality. I avoid them like the plague.

Also you have to replace tyres all the time, steel wheels last longer between services and are reconditioned on a lathe periodically instead of having to be continually replaced. It's one of several reasons why the longer term operating cost is way lower for trams than buses.

How many rubber wheel metros exist? I only know of a few -- Paris is one, but not all lines. Where do you live such you need to "avoid them like the plague"?