Meaning of SINGLE-TRACK in English
/sing"geuhl trak"/ , adj.
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.
[ 1825-35, Amer. ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012