After 2 hours and 25 minutes since an emergency application occurred, what air test must be performed?

The performance of a Class 3, Application and Release Air Brake Test is required after an emergency application has occurred, particularly following a specific time frame such as 2 hours and 25 minutes. This air test is necessary to ensure the integrity and functionality of the air brake system after the emergency has been applied because it allows for a verification of the brake components and the air pressure recovery within the system.

In situations where an emergency application occurs, the equipment must be thoroughly checked to confirm that all components are functioning properly and that there are no lingering issues stemming from the emergency situation. A Class 3 test specifically focuses on these aspects by confirming that the brakes can still be applied and released correctly after the emergency situation has been resolved.

Other options like a Class 1, Initial Terminal and Road Air Brake Test or a Class 2, Intermediate Brake Test serve different purposes and have different criteria regarding when they should be performed. A Class 1 test is typically conducted at the start of a trip or on newly assembled trains, while a Class 2 test is usually done at predetermined points to ensure proper functionality and is not specifically tied to the timing following an emergency application. The option stating that no air test is required does not ensure the safety and functionality required