52 kg rails are mostly used in A. Broad Gauge B. Meter Gauge C. Narrow Gauge D. Both (A) and (B)

The correct answer is: Both (A) and (B).

52 kg rails are mostly used in broad gauge and meter gauge railways. They are also used in some narrow gauge railways, but less commonly.

Broad gauge railways have a track gauge of 1,676 mm (5 ft 6 in). Meter gauge railways have a track gauge of 1,000 mm (3 ft 3 3⁄8 in). Narrow gauge railways have a track gauge of less than 1,000

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