'Broad gauge' definitions:

Definition of 'broad gauge'

(from WordNet)
noun
A railroad track (or its width) broader than the standard 56.5 inches

Definition of 'Broad gauge'

From: GCIDE
  • Broad gauge \Broad" gauge`\ (Railroad) A wider distance between the rails than the "standard" gauge of four feet eight inches and a half. See Gauge. [1913 Webster]