In article , R.C. Payne
writes
I can see that something like points failure can cause odd moves, but
in normal service, I though the Tower Hill - Whitechapel, and the Earls
Court - Gloucester Road sides of the respective triangles only see D
stock, not C stock, which would prevent reversals in normal service

That's true for most of the day, but there are scheduled C stock
workings over the Tower Hill to Whitechapel section: at one time, the
last Inner Rail circle train of the day went via Whitechapel rather than
direct just to turn the unit round (otherwise the C stock ends up with
asymmetric wheel wear).

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