A narrow mountain biking trail that is approximately the width of the bike, as opposed to double track, or fireroad, which is wide enough for four-wheeled off-road vehicles.
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(railways) Having only a single track so that trains may only run in one direction at a time.
On a single-track-mile basis, the following comparison may be made between apparent capital costs in Great Britain and the United States: - Single-Track Paid-up Capital Mileage.
In Great Britain the Board of Trade requires facing points to be avoided as far as possible; but, of course, they are a necessity at junctions where running lines diverge and at the crossing places which must be provided to enable trains to pass each other on single-track lines.
Two tunnels were built approximately parallel, each taking a single track.
There may be two complete lines of track or three lines of rails, one being common to both tracks, and the cars passing on a middle turnout or " parting "; or a single track with a parting.