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Double track
A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track.
== Overview ==
In the earliest days of railways in the United Kingdom, most lines were built as double-track because of the difficulty of co-ordinating operations before the invention of the telegraph. The lines also tended to be busy enough to be beyond the capacity of a single track. In the early days the Board of Trade did not consider any single-track railway line to be complete.
In the earliest days of railways in the United States most lines were built as single-track for reasons of cost, and very inefficient timetable working systems were used to prevent head-on collisions on single lines. This improved with the development of the telegraph and the train order system.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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