When a rear non-controlling DPU fault stalls and the dispatcher has the train behind cut-off to help you over the hill, how many locomotives are allowed at the rear if manned helpers are added?

When a rear non-controlling DPU fault stalls and the dispatcher has the train behind cut-off to help you over the hill, how many locomotives are allowed at the rear if manned helpers are added?

• A. Only one locomotive may be placed at the rear
• B. Additional locomotives may be placed on the rear of the train; makeup restrictions and EPA limitations apply
• C. No locomotives may be placed at the rear
• D. Two locomotives are required at the rear

Answer: (B)

When a rear non-controlling DPU fault stalls, you still have a way to provide the needed traction by adding locomotives at the rear as manned helpers to help you over the hill. The dispatcher can authorize this behind-the-train setup, so you’re not left stranded by a single failed DPU. However, you must follow makeup restrictions and EPA limitations. Makeup restrictions govern how many locomotives can be added and how the trailing units are arranged given train length, weight, and operating rules. EPA limitations ensure the added units meet environmental emission standards, which can restrict which locomotives you can use as rear helpers. So you can add more locomotives to assist, but only within those approved limits.

When a rear non-controlling DPU fault stalls, you still have a way to provide the needed traction by adding locomotives at the rear as manned helpers to help you over the hill. The dispatcher can authorize this behind-the-train setup, so you’re not left stranded by a single failed DPU. However, you must follow makeup restrictions and EPA limitations. Makeup restrictions govern how many locomotives can be added and how the trailing units are arranged given train length, weight, and operating rules. EPA limitations ensure the added units meet environmental emission standards, which can restrict which locomotives you can use as rear helpers. So you can add more locomotives to assist, but only within those approved limits.