Rail Operations & Train Handling Flashcards

When must a locomotive engineer provide a full-service brake reduction before making an emergency brake application on a long freight train?

Answer: When train speed exceeds 30 mph to prevent slack run-in

On long heavy trains above 30 mph, a full-service reduction before emergency helps manage slack action and reduces the risk of a derailment from severe buff forces.

What is meant by the term 'bunching' or 'buff force' in train handling?

Answer: The accumulation of slack in a compressed train that creates compressive forces between cars

Buff forces are compressive forces that occur when slack runs in (bunches), potentially causing derailments if the force is excessive.

Under FRA regulations, what is the minimum brake pipe pressure reduction required to initiate a full-service brake application on a freight train?

Answer: 16 psi

A full-service brake application requires a brake pipe reduction of at least 26 psi from the charged level, though 26 psi is the standard full-service reduction.

A train is stopped on a grade and must be held by hand brakes. According to FRA regulations, which factor primarily determines how many hand brakes are required?

Answer: Combined weight of cars and grade percentage

FRA regulations require that the number of hand brakes applied be sufficient to hold the cars based on their weight and the steepness of the grade.

What is the meaning of a 'restricted speed' signal indication in railroad operations?

Answer: Proceed at a speed that allows stopping within half the range of vision, not exceeding 15 mph

Restricted speed means proceeding at a speed that allows stopping within half the range of vision, not to exceed 15 mph, and looking out for obstructions.

Which FRA regulation governs locomotive safety standards, including cab conditions and safety appliances?

Answer: 49 CFR Part 229

49 CFR Part 229 establishes FRA's Railroad Locomotive Safety Standards, covering mechanical condition, safety appliances, and cab environment.

When a train crew detects a dragging equipment alarm from a wayside detector, what is the correct immediate response?

Answer: Stop the train and inspect for dragging equipment before proceeding

A dragging equipment alarm requires an immediate stop and inspection to identify and correct the dragging condition before movement is resumed.