About of Metro's track is underground, as are 47 of the 98 stations. Track runs underground mostly within the District and high-density suburbs. Surface track accounts for about of the total, and aerial track makes up . The system operates on a track gauge of , which is narrower than but within the tolerance of standard-gauge railways.
About of Metro's track is underground as are 47 of the 98 stations Track runs underground mostly within the District and high-density suburbs Surface track accounts for about of the total and aerial track makes up  The system operates on a track gauge of  which is narrower than but within the tolerance of standard-gauge railways