singletrack

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.

Origin:
1825–35, Americanism

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World English Dictionary
singletrack (ˈsɪŋɡəlˌtræk)
 
n
an off-road trail used by cyclists, wide enough for only one bicycle at a time

single-track
 
adj
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

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