REC TFREE REC Train Operations & Handling 3

Question 1

During a descending grade, an engineer notices brake cylinder pressure is not releasing after a brake release command. What is the most likely cause?

Accepted Answer

A stuck or frozen retaining valve

Answer

A stuck or frozen retaining valve can trap air in the brake cylinder, preventing full release even after a brake pipe pressure restoration.

Question 2

What is the purpose of a 'grade timing' technique during train handling?

Accepted Answer

Timing brake applications to control speed without overheating brakes

Answer

Grade timing involves applying and releasing brakes in a controlled cycle to manage speed on long descents while preventing brake shoe overheating.

Question 3

A 'stretch' move is used in train handling to:

Accepted Answer

Remove slack from the train in a controlled manner

Answer

A stretch move gently removes slack from couplers by applying a light throttle or braking so the train is in tension, reducing in-train forces.

Question 4

What FRA track class permits a maximum freight train speed of 60 mph?

Accepted Answer

Class 4

Answer

FRA Class 4 track allows freight train speeds up to 60 mph and passenger speeds up to 80 mph under standard conditions.

Question 5

An engineer receives a 'slow order' for 25 mph over a bridge. At what point is the train compliant with the slow order?

Accepted Answer

When the entire train is at or below 25 mph

Answer

The train is compliant when every car and locomotive in the consist is operating at or below the authorized speed limit for that section.

(REC) Railroad Engineer Certification Practice Test