What is the proper method for performing a standing brake test?

The proper method for performing a standing brake test involves charging the system and initially reducing the straight air to a specified pressure before applying power. This ensures that the brakes are tested under conditions that simulate an actual operating scenario while maintaining operational safety. By reducing the straight air to 30 psi and applying one point of power, the procedure verifies that the braking system can effectively engage and hold the train in place.

This method focuses on ensuring that the brakes are responsive and operational, which is crucial for safety during train operations. Additionally, using a specific pressure allows for a standardized approach in testing to minimize variables that could affect the performance of the brakes.

Other options suggest methods that do not provide the same level of reliability or safety. For instance, testing only when fully loaded may not account for various scenarios that the train might face during operation. Testing at a specific psi without applying any power can also fail to accurately simulate the conditions during a typical run. Lastly, performing the test with doors open could compromise safety and visibility, but it does not address the critical mechanics of brake functionality.