After 40 minutes from cutting off the locomotive, what air test should you perform on the train?

The situation described involves the need to perform a specific air brake test after a given time has passed since the locomotive was cut off. In this context, a Class 3, Application and Release Air Brake Test is required after 40 minutes of inactivity.

This type of test is essential as it checks for proper air brake function and ensures that air is being held in the brake system and that the brakes can be applied and released correctly. This test helps confirm that there are no leaks within the system that could compromise the safety and performance of the train. Conducting a Class 3 test at this point ensures that any issues with the air brakes are caught and addressed before the train is put back into service.

In contrast, the other options imply alternative testing protocols that might not be suitable for this specific scenario. For instance, a Class 2 test typically applies to situations where a system has been operational and adjustments have been made, while a Class 1 test is for initial setups before trains launch into a journey. Considering that the locomotive has been cut off for 40 minutes, a Class 3 test is the appropriate choice to ensure proper air efficiency and brake functioning before further movement of the train. Therefore, performing a Class 3 test in this situation