Regarding subway cars, what is an incorrect statement?

Subway cars are designed with specific safety and operational features that facilitate their functionality within the transit network. An accurate statement regarding subway cars is that they indeed have three uncoupling valves, which are critical for the safe and efficient separation of train cars when necessary, such as in emergencies or for maintenance.

Equipped with emergency brakes, subway cars must ensure the safety of passengers and crew by providing a quick method to stop the train in case of unforeseen circumstances. Additionally, the capacity of most subway cars typically accommodates up to 200 passengers, which is within the standard range for urban transit systems.

In contrast, the statement about subway cars having two uncoupling valves is inaccurate because they are actually designed with three. This difference underscores the design specifications that enhance reliability and safety in urban rail operations.