Emergency Position function is to?

Emergency Position function is to?

• A. Vents brake pipe air at an emergency rate.
• B. It reduces brake pipe 26 psi.
• C. It resets the brake after a penalty.
• D. It eliminates the brake pipe entirely.

Answer: (A)

Emergency position works by venting the brake pipe to the atmosphere at a high rate, causing the brake pipe pressure to drop quickly along the entire train. With brake pipe pressure falling rapidly, the brake valves respond by applying the brakes fully, producing a quick, strong stop. This contrasts with a regular service action, which reduces brake pipe pressure more gradually for controlled braking. The other descriptions don’t match how the emergency vent operates: it isn’t a fixed 26 psi drop, it doesn’t reset after a penalty, and it doesn’t remove the brake pipe entirely—the system is still able to be repressurized after the emergency is released.

Emergency position works by venting the brake pipe to the atmosphere at a high rate, causing the brake pipe pressure to drop quickly along the entire train. With brake pipe pressure falling rapidly, the brake valves respond by applying the brakes fully, producing a quick, strong stop. This contrasts with a regular service action, which reduces brake pipe pressure more gradually for controlled braking. The other descriptions don’t match how the emergency vent operates: it isn’t a fixed 26 psi drop, it doesn’t reset after a penalty, and it doesn’t remove the brake pipe entirely—the system is still able to be repressurized after the emergency is released.