When controlling train speed on a heavy or mountain grade, what is the limit for effective brake pipe reduction?

Prepare for the BNSF Air Brake and Train Handling Test. Utilize flashcards and multiple choice questions, each with hints and explanations to ensure exam readiness!

When controlling train speed on a heavy or mountain grade, an effective brake pipe reduction limit is crucial for maintaining safe and responsive braking. A 15 psi reduction is generally accepted as the maximum effective limit for brake pipe reduction in such challenging conditions. This is because a reduction beyond this limit could lead to issues such as excessive train slack action or loss of control over the braking response.

The choice of 15 psi is based on balancing the need for effective braking while minimizing the risk of brake release or other safety concerns that can arise from larger reductions. A reduction of this magnitude allows the engineer to apply sufficient brake force to manage speed while navigating the steep gradients without risking an uncontrolled descent or other complications associated with the dynamics of a long train.

This specified limit provides a guideline that ensures that the locomotive and brake system remain within their operational parameters, promoting a safe train handling strategy in mountainous or heavy grade situations.

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