Assertion: siding's use | /r/UsedFor | rapid transit
Facets:
Source sentences:
text: Track using 100 to 120 lb/yd (49.6 to 59.5 kg/m) rail is for lower speed freight branch lines or rapid transit (for example, most of the New York City Subway system track is constructed with 100 lb/yd (49.6 kg/m) rail).