Is it because they are lighter ??
In: Engineering
Among the other good answers here, some metro designs (e.g. Montreal) use rubber tires instead of typical train wheels, and also wood brake pads saturated with some kind of oil (although I wouldn’t be surprised if the brake materials were changed with the cars that were put in use in that couple of years.
UPDATE: the brakes are soaked in peanut oil. https://youtu.be/MdvQLYC5hGc
Not sure how many systems use this design around the world though.
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