singletrack

single-track [sing-guh l-trak] WORD ORIGIN adjective (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. having a narrow scope; one-track: He has a single-track mind. Liberaldictionary.com

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Origin of single-track An Americanism dating back to 1825–35 Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 British Dictionary definitions for singletrack singletrack noun an off-road trail used by cyclists, wide enough for only one bicycle at a time single-track adjective (of a railway) having only a single pair of lines, so that trains can travel in only one direction at a time (of a road) only wide enough for one vehicle able to think about only one thing; one-track Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012