What action should be taken if a car's brakes do not remain applied during testing?

In the context of rail operations, if a car's brakes do not remain applied during testing, the appropriate action is to retest the car once. This response acknowledges the need to ensure the safety and operability of the car's braking system. By conducting a retest, you can determine whether the initial failure was a one-time anomaly or indicative of a more serious issue. It is essential to confirm that the braking system is functioning properly before a car is deemed safe for service, as faulty brakes can pose significant safety risks during operation.

Retesting allows for a closer examination of the brake system's performance and provides an opportunity to identify any underlying problems that may need to be addressed. It is crucial to maintain safety standards and ensure that all vehicles in operation are fully functional to prevent accidents or other issues during train operation.