ctc and tu

In rail transport, the U.S. DOT-111 tank car, also known as the TC-111 in Canada, is a type of unpressurized general service tank car in common use in North America. Tank cars built to this specification must be circular in cross section, with elliptical, formed heads set convex outward. They have a minimum plate thickness of 7⁄16 inch (11.1 mm) and a maximum capacity of 34,500 US gallons (131,000 L; 28,700 imp gal). Tanks may be constructed from carbon steel, aluminum alloy, high alloy steel, or nickel plate steel by fusion welding.

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