All-in all, cylindrical
> wheels were a disaster for BART - still are. Let's
> hope that lessons were learned - and that the new
> car orders will correct this. Also learned should
> be that the technical history of the railway
> experience, should be respected.
>
> OPB

Cylindrical wheels reduce hunting of trucks. Hunting was a big problem with the first BART cars. You could really feel it at speed. That's why BART stopped using tapered tread wheels. This was the result of extensive research by BART.

Australian railroads use cylindrical wheels on their 42" gauge trains for the same reason. I understand that some Swiss railroads also use cylindrical wheels.