4 ft 8 1 ⁄ 4 in (1,429 mm) gauge The Washington Metro system in the D.C. metropolitan area was built to 4 ft 8 1 ⁄ 4 in (1,429 mm) narrow gauge.. 4 ft 8 in (1,422 mm) gauge. The worlds first operational mountainclimbing cog railway (rackandpinion railway), the Mount Washington Cog Railway in Coos County, New Hampshire — in operation since its opening in 1869 — uses a 4 ft 8 inch ...
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