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No difference available. This is the first major revision.
The pipe used to control train brakes on vehicles fitted with automatic air or vacuum brake systems. In the US, often referred to as the 'train line'. On air braked trains, when charged, the brake pipe causes the train brakes to be released and the reservoirs (called auxiliary reservoirs) used to apply brakes to be automatically replenished. When pressure in the brake pipe is reduced, train brakes are applied.