Before cutting away from the rear portion of your train with a set out, what securement procedure should be used?

• A. 20 psi brake pipe reduction
• B. Close angle cock on Locomotive after brake pipe exhaust ceases
• C. Leave angle cock open on the portion left standing to ensure air is not bottled
• D. Tie sufficient hand brakes

Answer: (D)

When you cut away from the rear portion, the immediate priority is to prevent any movement of the part you’re leaving behind. A reliable, positive restraint comes from applying handbrakes on the cars that remain in place. By tying sufficient handbrakes, you create a mechanical lock independent of the air brake system, which helps ensure the rear portion won’t roll even if there's a delay or issue with brake pipe pressure or air flow.

Relying on air brake manipulations like reducing brake pipe pressure, closing or leaving angle cocks in certain positions, or expecting air to prevent movement is not as dependable for securing the cut portion. Handbrakes provide a direct physical restraint, making them the appropriate securement method in this scenario.