In article , James
writes
If stock
which has wheels ¼" further apart tries to run on such rails, there
are likely to be no problems, although they may end up riding on the
wheel-flanges.

Riding on the flanges would not be a good thing. They aren't coned, so
the self-steering property of a wheelset wouldn't be there. And since
the flanges aren't in the right place to act as a last resort, you'd
derail within a few metres.

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