When the automatic brake valve handle is in the release position, where is air for charging supplied from?

When the automatic brake valve handle is in the release position, air for charging is supplied from Main Reservoir 2. This reservoir provides the necessary pressurized air to the braking system, ensuring that the train's brakes can be released promptly for safe and efficient operation.

In rail operations, the main reservoirs serve as critical storage for compressed air, which is vital for controlling the train's pneumatic systems, including braking. The design differentiates between several reservoirs, where Main Reservoir 2 typically holds the additional supply needed specifically when the valve is in a state that requires charging.

Utilizing the air from this reservoir allows for a quick and effective charging of the brake setup, ensuring that the system is ready for the next braking sequence or operational requirement. This functionality is crucial for maintaining the performance and safety of the braking system during train operations.