single-track

[ sing-guhl-trak ]

adjective

1. (of a railroad or section of a railroad's route) having but one set of tracks, so that trains going in opposite directions must be scheduled to meet only at points where there are sidings.
2. having a narrow scope; one-track:

   He has a single-track mind.

single-track

adjective

1. (of a railway) having only a single pair of lines, so that trains can travel in only one direction at a time
2. (of a road) only wide enough for one vehicle
3. able to think about only one thing; one-track

Word History and Origins

Origin of single-track¹

An Americanism dating back to 1825–35

Example Sentences

Trails range from easy and meandering to moderate, traipsing through meadows, old logging roads and switchbacks with plenty of wildflowers and great views — like the Arrowleaf Trail, a single-track that leads through ponderosa pines and pasture to a steady climb to the peak over five miles round trip.

From Seattle Times

For almost 20 years, Cardiff Bay has seen just a shuttle service going down the single-track branch from Cardiff Queen Street - and despite that, it was Wales' fifth busiest pre-pandemic with about 1.5m passengers a year.

From BBC

It’s the first single-track connection from Carson City to Lake Tahoe.

From Los Angeles Times

But not today, with police vehicles parked up firmly blocking off the single-track road.

From BBC

It’s the first single-track connection from Carson City to Lake Tahoe.

From Los Angeles Times