MC 307 / DOT 407 designates which type of tank car?

MC 307 / DOT 407 designates which type of tank car?

• A. High pressure tank car
• B. Cryogenic tank car
• C. Low pressure tank car
• D. Non-pressurized tank car

Answer: (C)

The designations reflect how much internal pressure the tank is built to hold. MC 307 / DOT 407 identify a low-pressure tank car. These cars are designed to contain liquids under a small amount of internal pressure—not the very high pressure of high‑pressure gas cars, not the extreme cold of cryogenic cars, and not entirely unpressurized like a gravity-feed car. The low-pressure classification means the tank has features to handle and limit modest pressure while transporting contents that don’t require full pressurization.

The designations reflect how much internal pressure the tank is built to hold. MC 307 / DOT 407 identify a low-pressure tank car. These cars are designed to contain liquids under a small amount of internal pressure—not the very high pressure of high‑pressure gas cars, not the extreme cold of cryogenic cars, and not entirely unpressurized like a gravity-feed car. The low-pressure classification means the tank has features to handle and limit modest pressure while transporting contents that don’t require full pressurization.