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

FRA Class 5 track permits a maximum freight train speed of 80 mph and passenger train speed of 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

Hot box detectors use infrared sensors to scan passing train components for abnormally high heat, particularly at journal bearings, and alert crews and dispatchers of potential failure conditions.

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

An Advance Approach signal warns the engineer that the signal two blocks ahead is at Stop, requiring a reduction to approach speed so the train can stop at the next signal if necessary.

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

Restricted speed requires the engineer to operate at a speed that allows stopping within half the range of clear vision short of a train, obstruction, or misaligned switch, and must not exceed 20 mph.

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

Track geometry cars use sensors and measurement systems to continuously record rail gauge, cross-level, alignment, surface, and curvature, allowing railroads to identify and prioritize track defects before they cause derailments.

(LEC) Locomotive Engineer Certification Practice Test

(LEC) Locomotive Engineer Certification Practice Test

LEC Track & Signal Systems 3