A ___________ tank car is designed to carry low-pressure, refrigerated liquids at -130 degrees F and below

• A. Cryogenic liquid
• B. Non-pressurized
• C. Pressurized
• D. Ambient

Answer: (A)

Transporting extremely cold liquids requires a tank car built for cryogenic service. Cryogenic liquids are kept at -130°F and below, so the car must minimize heat input to preserve those temperatures and maintain low pressure inside. This is achieved with a double-wall, vacuum-insulated design and compatible fittings that reduce boil-off. That’s why describing the car as a cryogenic liquid tank car is the best fit. Other options refer to liquids at ambient temperatures or to designs for higher pressure, which don’t match the needs of ultra-cold, low-pressure storage. Examples of cryogenic cargos include liquid nitrogen, oxygen, argon, and LNG.