Double-track railway

This article is about the use of two tracks on a railway line. For the sound recording technique, see doubletracking.
"Double line" redirects here. For other uses, see Double line (disambiguation).

A double-track railway line running through a wooded area.
A bi-level railway bridge carries a small passenger train on the upper level. The lower level is marked with a "Danger" sign.
Driving Creek Railway, New Zealand

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.