track-basher noun a specialist trainspotter who travels (and so “collects”) little-used sections of the rail network UK
More worrying still than the description of the bashers [who “collect” trains by travelling on them] was that of track-bashers, whose mission is to seek out obscure lengths of seldom-travelled track[.] — Iain Aitch, AFeteWorseThanDeath, p. 55, 2003