40 years for cars built before July 1974; 50 years for cars built after July 1974.
Extensions can be granted for extensive rebuilds or specific waivers (a lot of TTX autorack flatcars are certified for 65-year extended service life).
40 years for cars built before July 1974; 50 years for cars built after July 1974.
Extensions can be granted for extensive rebuilds or specific waivers (a lot of TTX autorack flatcars are certified for 65-year extended service life).