> BART discovered cylindrical wheels in 2018 ?? This is a 2018 piece describing how they moved from cylindrical wheels to an advanced wheel profile. I don't t

> BART discovered cylindrical wheels in 2018 ?? This is a 2018 piece describing how they moved from cylindrical wheels to an advanced wheel profile. I don't think they're claiming the new, non-cylindrical profile is particularly advanced, either, but just carefully optimized to maintain a single point of contact even as the wheel wears.