A rail car with exposed fittings is designated as what type of car?

• A. High-pressure tank
• B. Nonpressure or low-pressure tank
• C. Cryogenic tank
• D. Dedicated tank

Answer: (B)

A rail car with exposed fittings is designated as a nonpressure or low-pressure tank car because such cars are designed to transport liquids or gases that do not require containment under high pressure. The exposed fittings indicate that these tanks operate at lower pressure, allowing for easier access and potential connection to transfer lines during loading or unloading.

Nonpressure or low-pressure tank cars are typically used for materials that can be safely transported without requiring the additional structural integrity that comes with high-pressure containment systems. In contrast, high-pressure tank cars are built to withstand greater internal pressures, making their fittings more secure and often covered or reinforced to ensure safety. Cryogenic tanks, used for materials at extremely low temperatures, would also have specialized fittings to manage the conditions involved, while dedicated tanks refer to those specifically assigned for certain materials but do not imply the nature of pressure.