Gauge
Defined in 2 dictionaries — Black's (1910), Black's (1891)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The measure of width of a rall-way, fixed, with some exceptions, at 4 feet 8 inches in Great Britain and America, and 5 feet 3 inches in Ireland.
A Dictionary of Law
Henry Campbell Black · 1891
The measure of width of a railway, fixed, with some exceptions, at 4 feet 8% inches in Great Britain and America, and 5 feet 3 inches in Ireland.