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Re:A new way of keeping trains apart uses magnetic signals i... by kevincox on Saturday October 01, 2022 @04:38PM (#33049890)
> their diameter changes

To be clear they are not cylinders, but cones (truncated). Do depending on how the train wobbles they will spin differently to travel the same distance even if they don't slip. So you definitely need some method of regular correction if you want accurate measurements.

Re:A new way of keeping trains apart uses magnetic signals i... by NamTaf on Sunday October 02, 2022 @08:38AM (#33055400)
I in fact meant that they wear through quite substantial diameter differences, but yes conical tread will further throw it out.