Actually it's the opposite.
The rail gauge on curves is slightly widened. This is to accomodate the wheel base of long trucks and steam locomotive driver sets. The tighter the curve, the wider that spread, up to a limit of course.
There is a chart for this in one of my B&O Maintenance of Way books. It also tells how much of a gap must be made at a bolted rail joint, depending on the ambient temperature when the joint is made fast. The B&O also used rail thermometers that had two scales. One was for the temperature, the other showed the rail gap size required.
Ed Bommer
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