Quadruple-track railway
Line containing four paths for trains / From Wikipedia, the free encyclopedia
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A quadruple-track railway (also known as a four-track railway) is a railway line consisting of four parallel tracks with two tracks used in each direction. Quadruple-track railways can handle large amounts of traffic, and so are used on very busy routes or sections. Such conversion is referred to as "quadruplication".
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A railway line with six parallel tracks, or a sextuple-track railway, has three tracks in each direction. The corresponding term is "sextuplication".
There are also instances of railway lines or sections with eight tracks, and cases with three or five tracks. All experience similar upsides and downsides.