side track

/S AY1 D T R AE0 K/
noun
  1. 1

    Alternative form of sidetrack. [(rail transport) A second, relatively short length of track just to the side of a railroad track, joined to the main track by switches at one or both ends, used either for unloading freight, or to allow two trains on a same track to meet (opposite directions) or pass (same direction); a railroad siding.]