Jelaskan United Kingdom dari Lebar sepur ganda

The Great Western Railway in Britain was originally built to a broad gauge of 2134 mm (7 ft 0 in), subsequently widened to 2140 mm (7 ft 0 in). After a "gauge war", the gauge was converted to . A dual-gauge system was easily installed as the gauges were well separated and the line had wooden sleepers. A short section of broad and standard gauge is at the Great Western Society site at Didcot.

The port authority in Derry, Northern Ireland used a dual-gauge line in a street-level network to transfer freight. Two of the city's stations were on a narrow  gauge. The other two city stations were on broad  gauge.