Minimum gauge Narrow-gauge railway
gauges below 1 ft 11 ⁄2 in (597 mm) rare, did exist. in britain, sir arthur heywood developed 15 in (381 mm) gauge estate railways, while in france decauville produced range of industrial railways running on 500 mm (19 ⁄4 in) , 400 mm (15 ⁄4 in) tracks, commonly in restricted environments such underground mine railways, parks , farms. several 18 in (457 mm) gauge railways built in britain serve ammunition depots , other military facilities, particularly during world war i.
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