LEC Track & Signal Systems 3

Question 1

What is the maximum authorized speed for freight trains on FRA Class 5 track?

Accepted Answer

80 mph

Answer

60 mph

Answer

70 mph

Answer

90 mph

Question 2

What is the primary function of a wayside hot box detector (HBD)?

Accepted Answer

To detect overheated journal bearings that could lead to axle failure or derailment

Answer

To measure wheel flange depth to detect worn wheels passing the detector

Answer

To monitor brake shoe temperature and alert crews of dragging brakes

Answer

To identify locomotives exceeding the posted track speed limit

Question 3

What does an 'Advance Approach' signal aspect indicate to the locomotive engineer?

Accepted Answer

The signal two blocks ahead is at Stop; slow to approach speed at the next signal

Answer

The next signal is Clear; proceed at maximum authorized speed

Answer

Reduce speed immediately to 15 mph and stop before the next switch

Answer

The track ahead is under maintenance; proceed at 10 mph

Question 4

Which best describes 'restricted speed' as used in railroad signal rules?

Accepted Answer

A speed that allows stopping within one-half the range of vision but not exceeding 20 mph

Answer

The maximum speed posted on the current speed sign minus 10 mph

Answer

A speed of 15 mph applied only when operating in reverse through a yard

Answer

The dispatcher-assigned speed for a specific train on a specific day

Question 5

What is the primary purpose of track geometry measurement cars operated by railroads and the FRA?

Accepted Answer

To measure track parameters such as gauge, alignment, and surface to detect defects before failure

Answer

To photograph rail head surface conditions for documentation and insurance purposes

Answer

To test locomotive performance under revenue service conditions

Answer

To calculate ballast depth requirements for new track construction projects

Question 6

When operating under a 'Proceed at Restricted Speed' indication, the engineer must:

Accepted Answer

Be prepared to stop within half the range of vision and look for misaligned switches and obstructions

Answer

Reduce to 10 mph only in yard limits, then resume track speed

Answer

Contact the dispatcher before entering each successive block

Answer

Reduce speed to 20 mph and sound the horn at all road crossings

Question 7

What is the primary function of a wayside dragging equipment detector (DED)?

Accepted Answer

To identify components hanging below the car that could strike the rail or cause a derailment

Answer

To measure wheel diameter and detect wheels worn below FRA minimum standards

Answer

To detect flat spots on wheel treads caused by emergency brake applications

Answer

To measure coupler height to ensure proper alignment between cars