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Front #143

ABTH 103.3C

When performing a running release of the air brakes, which of the following is true?

  1. Increase the brake pipe reduction to 15 psi, and after the exhaust at the automatic brake valve stops, wait an additional 30 seconds before releasing the brakes.
  2. Increase brake pipe reduction to 15 psi and allow the exhaust at the automatic brake valve to stop before releasing the brakes.
  3. Increase the brake pipe reduction to 10 psi, and after the exhaust at the automatic brake valve stops, wait an additional 30 seconds before releasing the brakes.
  4. Increase brake pipe reduction to 10 psi and allow the exhaust at the automatic brake valve to stop before releasing the brakes.
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ABTH 103.3C


Answer: Increase brake pipe reduction to 10 psi and allow the exhaust at the automatic brake valve to stop before releasing the brakes.
Feedback:
A10 psi brake pipe reduction will allow for an accelerated service release of the brakes when the automatic brake valve is moved to the Release position. Accelerated service release cuts release times in half and greatly reduces in-train forces. Wait for the exhaust to stop before moving the automatic brake to release to allow for the air to travel through the entire brake pipe.