single-track adjective 2single track noun 1forms 1 adjective2 •Having only a single track so that trains may only run in one direction at a time.On the now defunct Guildford-to-Horsham line, there was a foolproof way of avoiding collisions on singletrack lines — 2016 •Having a single curriculum or other educational approach for all students. single track noun1 •A single rail line, where trains can only run in one direction at a time between passing points. formssingle tracks
