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double-track railway line  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.   Brough station, Yorkshire, UK. Platform 1 is for
trains north and east bound, platform 2 is for trains south and
west bound Partially restored double-track section south of
Wymondham Abbey, Norfolk, UK on the Mid-Norfolk Railway  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.  Double track at
Titanic Quarter, UK on the Belfast-Bangor railway line.  In the
earliest days of railways in th