"Rail is graded by weight over a standard length. Heavier rail can support greater axle loads and higher train speeds without sustaining damage than lighter rail, but at a greater cost. In North America and the UK, rail is graded in pounds per yard (usually shown as pound or lb), so 130-pound rail would weigh 130 lb/yd (64.5 kg/m). The usual range is 115 to 141 lb/yd (57.0 to 69.9 kg/m)"
"North American railroads until the mid- to late-20th century used rails 39 ft (11.89 m) long so they could be carried to and from a worksite in gondola cars (open wagons), often 40 ft (12.2 m) long; as gondola sizes increased, so did rail lengths"
So 130 lb a yard at 40 feet times 2 rails = 3466.6 lbs for 40 ft of track.
Not counting the ties and ballast.

http://en.wikipedia.org/wiki/Track_(rail...

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