Which feature describes a non-pressure tank car?

• A. Has a dome
• B. No dome and visible valves/fittings
• C. Dome with external valves
• D. Dome and external fittings

Answer: (B)

Non‑pressure tank cars are built to carry liquids without maintaining internal pressure, so they don’t use a dome to house valves or relief equipment. Instead, any valves and fittings are placed on the outside of the tank, making them visible and accessible without a dome cover. This exterior arrangement is a clear indicator that the car is not designed for pressurized contents.

Seeing a dome or having any fittings housed inside a dome would point to a different type of tank car (one that handles pressure or requires a dome for access and relief). That’s why the description stating there is no dome and that valves and fittings are visible on the exterior best matches a non‑pressure tank car.