Which of the following statements is incorrect about subway cars?

Subway cars are equipped with various features designed for safety, functionality, and capacity to transport passengers effectively.

While it is common for subway cars to have features like emergency brakes and automatic doors, the statement regarding four trip cocks is not a standard characteristic across all subway car designs. Trip cocks are safety devices used primarily in some train systems to detect the presence of a train at certain points or to activate specific safety mechanisms. The variation in the number and type of trip cocks can differ based on the design of the car and the systems in use at different transit agencies.

The other features mentioned—emergency brakes, the ability to accommodate varying passenger loads, and automatic door mechanisms—are standard elements in modern subway car designs, which ensure that the vehicles are safe, efficient, and capable of handling the diverse needs of urban transit systems.