What must you confirm before proceeding after restoring brake pipe pressure following a broken knuckle replacement?

Before proceeding after restoring brake pipe pressure following a broken knuckle replacement, it is essential to ensure that the gauge indicates proper pressure. This confirmation is crucial because the integrity and functionality of the air brake system directly depend on maintaining adequate brake pipe pressure. If the pressure is not at the appropriate level, it may compromise the ability to safely apply the brakes, which can lead to dangerous situations while the train is in motion.

While ensuring the train is completely secured, notifying the dispatcher, and confirming the success of the air test are all important aspects of proper train handling and safety protocols, the immediate step after restoring brake pipe pressure involves checking the gauge. This ensures that the air brake system will operate as designed, enabling safe train operation before taking any further actions.