TFREE REC Train Operations & Handling

Question 1

What is the primary purpose of the automatic brake system on a train?

Accepted Answer

Apply brakes to all cars

Answer

The automatic brake system is designed to apply braking force simultaneously to all cars in a train, not just the locomotive. This ensures uniform deceleration across the entire train, which is crucial for safely stopping long and heavy consists and preventing excessive in-train forces.

Question 2

When descending a long grade, what technique should be used to prevent overheating the brakes?

Accepted Answer

Dynamic braking and intermittent applications

Answer

When descending a long grade, using dynamic braking significantly reduces the workload on the friction brakes by converting the train's kinetic energy into electrical energy. Intermittent applications of the air brakes allow the brake shoes and wheels to cool between applications, preventing overheating and potential brake fade, which could lead to a loss of control.

Question 3

What is the role of a locomotive engineer at a highway-rail crossing?

Accepted Answer

Sound the horn and remain alert

Answer

At highway-rail crossings, the locomotive engineer's primary responsibility is to ensure safety. Sounding the horn provides an audible warning to motorists and pedestrians, while remaining alert allows the engineer to react to any unexpected situations or hazards that may arise at the crossing.

Question 4

What does 'in-train forces' refer to?

Accepted Answer

Forces between rail cars

Answer

In-train forces refer to the dynamic pushing (buff) and pulling (draft) forces that are transmitted between individual rail cars through their couplers. Managing these forces is critical for smooth train handling, preventing damage to equipment, and avoiding derailments, especially during acceleration, deceleration, or changes in grade.

Question 5

Which braking system helps reduce wear on brake shoes?

Accepted Answer

Dynamic brake

Answer

The dynamic brake system helps reduce wear on brake shoes by using the locomotive's traction motors as generators to create resistance, slowing the train without friction. This significantly extends the life of the air brake components, such as brake shoes and wheels, by reducing their operational stress and heat buildup.

(REC) Railroad Engineer Certification Practice Test

(REC) Railroad Engineer Certification Practice Test

TFREE REC Train Operations & Handling