A tank car is a piece of
railroad rolling stock designed to carry
liquefied loads,
petroleum products, liquid
chemicals and
gasses. Many variants exist due to the wide variety of
liquids and gases that can be transported. Tank cars can be
insulated or non-insulated,
pressurized or non-pressurized, and designed for single or multiple loads. Non-pressurized cars have plumbing at the bottom for unloading, and may have an access port and a dome, housing various valving on the top. Pressurized cars have a pressure plate, with all valving, and a protective cylindrical housing (dome) at the top. Loading and unloading are done through this opening.
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