LEC Track & Signal Systems 2 — Questions and Answers
Question 1: What does a 'Slow Clear' signal aspect require the engineer to do?
- Stop and contact the dispatcher before proceeding
- Proceed through the turnout at or below the slow speed limit, then resume normal speed (Correct answer)
- Reduce to restricted speed and be prepared to stop short of any obstruction
- Proceed at the maximum authorized speed for the territory
Correct answer: Proceed through the turnout at or below the slow speed limit, then resume normal speed
A Slow Clear signal requires the engineer to reduce speed to the designated slow speed (typically 15 mph) through the turnout, after which normal authorized speed may resume.
Question 2: Under FRA track classification standards, what is the maximum freight train speed on Class 1 track?
- 5 mph
- 10 mph (Correct answer)
- 15 mph
- 20 mph
Correct answer: 10 mph
FRA Class 1 track permits a maximum freight train speed of 10 mph and passenger train speed of 15 mph, representing the lowest classification for main track.
Question 3: What does an Absolute Block system ensure in railroad operations?
- That only one train occupies a block section at any given time (Correct answer)
- That all signals automatically reset to Stop when power fails
- That PTC overrides the engineer whenever a rule violation is detected
- That all trains operate at the same speed within a division
Correct answer: That only one train occupies a block section at any given time
An Absolute Block system ensures that only one train is permitted within a designated block section at any time, providing the most fundamental form of train separation.
Question 4: What is 'dark territory' in the context of railroad signal systems?
- Track segments that are temporarily closed for maintenance after sunset
- A section of railroad where no wayside signals or PTC exist, requiring train order or track warrant authority (Correct answer)
- Areas where cab signals are required because wayside signals are not visible
- Track rated for slow speeds due to insufficient lighting at grade crossings
Correct answer: A section of railroad where no wayside signals or PTC exist, requiring train order or track warrant authority
Dark territory refers to sections of track that have no automatic block signals, cab signals, or PTC, requiring dispatchers to issue track warrants or train orders to authorize train movements.
Question 5: When a 'Medium Approach' signal is displayed, the engineer must:
- Proceed at medium speed and prepare to stop at the next signal (Correct answer)
- Stop immediately and contact the dispatcher
- Proceed at restricted speed through the next block
- Reduce to medium speed and expect the next signal to be clear
Correct answer: Proceed at medium speed and prepare to stop at the next signal
A Medium Approach signal requires the engineer to proceed at medium speed (typically not exceeding 30 mph) and be prepared to stop before passing the next signal.
Question 6: What is the primary role of a Centralized Traffic Control (CTC) system?
- To automatically couple and decouple cars at classification yards
- To allow a central dispatcher to remotely control signals and switches over a large territory (Correct answer)
- To record and report all locomotive speed violations to the FRA
- To manage locomotive fuel distribution across a railroad division
Correct answer: To allow a central dispatcher to remotely control signals and switches over a large territory
CTC allows a single dispatcher to remotely operate switches and signals across a large section of railroad, enabling efficient routing and spacing of multiple trains without requiring local operators at each location.
Question 7: What does 'track authority' mean for a locomotive engineer in non-signaled territory?
- The engineer's FRA-issued license to operate on a specific railroad line
- The legal permission to occupy and operate over a defined segment of track (Correct answer)
- The maximum speed the locomotive is mechanically rated to achieve
- The dispatcher's verbal confirmation that the locomotive is mechanically fit
Correct answer: The legal permission to occupy and operate over a defined segment of track
Track authority is the formal permission—issued via track warrant, track bulletin, or dispatcher communication—that authorizes an engineer to occupy a specific block or segment of track.
LEC Track & Signal Systems 2
What does a 'Slow Clear' signal aspect require the engineer to do?