Elsewhere in this thread, jcrawfordor explains that hunting oscillation from conical wheels can cause “chatter” at higher speeds which led to BART’s experimenta

Elsewhere in this thread, jcrawfordor explains that hunting oscillation from conical wheels can cause “chatter” at higher speeds which led to BART’s experimentation with cylindrical wheels [1][2]. Others also note that the wheels of high-speed trains are closer to cylinders than cones. [3][4] [1]: https://news.ycombinator.com/item?id=28350423 https://news.ycombinator.com/item?id=28350423 [2]: https://news.ycombinator.com/item?id=28350667 https://news.ycombinator.com/item?id=28350667 [3]: https://news.ycombinator.com/item?id=28350755 https://news.ycombinator.com/item?id=28350755 [4]: https://news.ycombinator.com/item?id=28352896 https://news.ycombinator.com/item?id=28352896