The usual lengths are 8, 8½, or 9 feet, with a cross section between 6 inches × 7 inches and 7 inches × 9 inches. Treated ties can last an average of 25 to 40 years, although they may have a much shorter life due to mechanical wear.
American Railroad Engineering Association.
Manual.
(revised annually).
Federal Specification MM-T-371.
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Last revised: 10 April 2008.