What position should the cut-out cock be in for normal brake operation?

For normal brake operation, the cut-out cock should be in the open position. This allows the air brake system to function as intended, enabling the flow of air to the brake cylinders. When the cut-out cock is open, the air from the main reservoir is accessible to the brake components and can be effectively utilized to apply and release the brakes, ensuring proper and safe operation of the train’s braking system.

If the cut-out cock were closed or in a neutral position, air would be restricted, leading to possible braking failure or inadequate braking efficiency, which is critical for the safety and performance of the train. Thus, keeping the cut-out cock open is essential for maintaining effective brake functionality during normal operations.