What device can be used to check if the brake pipe pressure is restored during an air brake test?

The correct choice of an accurate gauge or an ETD (Electronic Train Detector) is essential for determining if the brake pipe pressure has been successfully restored during an air brake test. This device provides precise measurements of the brake pipe's pressure, which is crucial to ensure that the air brake system is functioning correctly after maintenance or before a train departs.

The accurate gauge delivers real-time data on pressure levels, allowing the conductor to verify that the system is achieving the necessary pressure for safe operation. The ETD adds additional monitoring capabilities by electronically assessing the functionalities of the air brake system, enhancing reliability and efficiency in conducting these tests.

Using a speedometer would not provide relevant information about brake pipe pressure, as it measures the train's speed rather than pneumatic pressures. A manual pressure valve may control pressure but does not offer a direct measurement needed for confirming pressure restoration. A punch test is unrelated to measuring brake pipe pressure, making it inadequate for this scenario.