Hi Mark
Over the last few years I have read many articles about obtaining good
running and all seem to imply that following consistent standards is
vital, especially through pointwork.
I dont know what exact impact the extra 0.1 - 0.2 will make in
practice but it will have a corresponding effect on check to flange
and check to gauge (see Files - standards). These I know can have an
impact as the wheel is likely to hit the crossing nose and therefore
can derail.
Regards
John