Pound rail is a railroad term that indicates the weight of rail per yard. For example one yard of '132-pound rail' weighs 132 pounds. Sizes under 100 pound rail are usually for lighter duty freight, low use trackage, or light rail. Track using 100 to 120 pound 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 pound rail). Main line track is usually built with 130 pound rail or heavier. Rail transport refers to the land transport of passengers and goods along railways or railroads. ... track Rail tracks are used on railways (or railroads), which, together with railroad switches (or points), guide trains without the need for steering. ... This article is about the unit of measure known as the yard. ... This article is about light rail systems in general. ... A branch line is a relatively minor railway line which branches off a more important through route. ... This article or section does not cite its references or sources. ... The New York City Subway system, a large rapid transit system operated by the Metropolitan Transportation Authority (MTA) in New York City, is one of the most extensive public transportation systems in the world. ...