Interlocking Limits Quiz - 15 Questions

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  • 1/15 Questions

    What is an Interlocking?

    • A railroad crossing at grade.
    • Signal appliances that are interconnected so that each of their movements follows the other in a proper sequence. Interlocking's may be operated manually or automatically.
    • The fixed signals of an interlocking that govern trains using interlocking limits.
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About This Quiz

The 'Interlocking Limits Quiz - 15 Questions' assesses understanding of railroad interlocking systems, including their components, functions, and operational limits. It is designed for learners in transportation and railroad engineering, enhancing knowledge critical for safety and efficiency in rail operations.

Interlocking Limits Quiz - 15 Questions - Quiz

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  • 2. 
    Can an interlocking signal function as a block signal?Rule 9.3 - ProProfs

    Can an interlocking signal function as a block signal?Rule 9.3

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    According to Rule 9.3, an interlocking signal can function as a block signal. This means that the interlocking signal not only controls the movement of trains within the interlocking limits but also serves as a block signal for trains approaching the interlocking limits. Therefore, it can perform the functions of both an interlocking signal and a block signal simultaneously.

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  • 3. 

    What is a block signal?

    • A fixed signal at the entrance of a block that governs trains entering and using that block.

    • A fixed signal that is fixed to a location permanently and that indicates a condition affecting train movement.

    • A length of track between consecutive block signals.

    Correct Answer
    A. A fixed signal at the entrance of a block that governs trains entering and using that block.
    Explanation
    A block signal is a fixed signal at the entrance of a block that governs trains entering and using that block. This means that the signal controls the movement of trains into and within a specific section of track, ensuring safe and efficient train operations. The signal indicates whether a train can proceed or must stop before entering the block, helping to prevent collisions and maintain proper spacing between trains.

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  • 4. 
    The rear of the train has stopped between the outer opposing signals of a Manual Interlocking and needs to change direction.  What, if anything, is required before changing direction?   Rule 6.4.2  - ProProfs

    The rear of the train has stopped between the outer opposing signals of a Manual Interlocking and needs to change direction.  What, if anything, is required before changing direction?   Rule 6.4.2 

    • A crew member must inspect the signals on the opposing track to ensure that a STOP indication is displayed. The train may then move only on the crew member's signal.

    • If at least one car length remains between the outer opposing signals a change of direction may be made without permission.

    • The crew must obtain permission from the control operator to change directions.

    Correct Answer
    A. The crew must obtain permission from the control operator to change directions.
    Explanation
    Before changing direction, the crew must obtain permission from the control operator.

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  • 5. 

    What is Interlocking Limits?

    • Signal appliances that are interconnected so that each of their movements follows the other in a proper sequence. Interlockings may be operated manually or automatically.

    • The tracks between outer opposing absolute signals of an interlocking.

    • The fixed signals of an interlocking that governs trains using interlocking limits.

    Correct Answer
    A. The tracks between outer opposing absolute signals of an interlocking.
    Explanation
    Interlocking limits refer to the tracks located between the outer opposing absolute signals of an interlocking system. These tracks are controlled by signal appliances that are interconnected, ensuring that the movements of trains follow a proper sequence. Interlockings can be operated either manually or automatically.

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  • 6. 

    How must a train approach a railroad crossing at grade that is NOT protected by interlocking signals?   Rule 6.16 

    • Prepared to stop. If a stop sign protects the area, the train must stop before any part of the train or engine passes the stop sign.

    • If a gate is lined against the intended route, trains and engines must stop and remain at least 50 feet from fouling the track on the conflicting route until the gate is changed to the stop position on the conflicting route.

    • Both answers are correct

    Correct Answer
    A. Both answers are correct
    Explanation
    According to Rule 6.16, when approaching a railroad crossing at grade that is not protected by interlocking signals, there are two scenarios to consider. First, if a stop sign is present, the train must come to a complete stop before any part of the train or engine passes the stop sign. Second, if a gate is lined against the intended route, the train must stop and remain at least 50 feet away from fouling the track on the conflicting route until the gate is changed to the stop position on the conflicting route. Both of these answers correctly describe the actions that must be taken in these situations.

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  • 7. 

    When operating in non-signaled territory, what may govern the approach to an interlocking?Glossary

    • Block signal

    • Distant signal

    • Controlled signal

    Correct Answer
    A. Distant signal
    Explanation
    When operating in non-signaled territory, the approach to an interlocking may be governed by a distant signal. Distant signals are used to provide advance warning to train operators of the status of the track ahead. They are typically located a significant distance before the interlocking and indicate whether the track ahead is clear or occupied. By obeying the indications of the distant signal, train operators can adjust their speed and prepare for any upcoming signals or interlockings.

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  • 8. 

    If operating within the limits of Track and Time, may a train pass a STOP indication governing a Manual Interlocking?Rule 10.3

    • Within the limits of track and time, a train may pass a signal displaying STOP without stopping.

    • After stopping at a signal displaying STOP, a train may pass the signal at restricted speed.

    • Track and time does not authorize trains to occupy the track(s) within interlocking limits.

    Correct Answer
    A. Track and time does not authorize trains to occupy the track(s) within interlocking limits.
    Explanation
    According to Rule 10.3, trains operating within the limits of Track and Time are not authorized to occupy the track(s) within interlocking limits. This means that even if a train is operating within the limits of Track and Time, it is still not allowed to pass a STOP indication governing a Manual Interlocking. The correct answer states this fact without explicitly mentioning the phrase "The correct answer is."

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  • 9. 

    How will a train be governed at a STOP indication that governs movement over an Automatic Interlocking?  Rule 9.12.3

    • At a signal displaying a STOP indication, the crew will be governed by instructions in the release box.

    • If the train dispatcher cannot be contacted, move 100 feet past the interlocking signal, wait 5 minutes, and then proceed at restricted speed.

    • A crew member must immediately contact the control operator unless the train is within track and time limits.

    Correct Answer
    A. At a signal displaying a STOP indication, the crew will be governed by instructions in the release box.
    Explanation
    When a train approaches a signal displaying a STOP indication that governs movement over an Automatic Interlocking, the crew must follow the instructions provided in the release box. This means that they need to consult the information or directions given in the release box to determine what actions they should take. The release box contains specific instructions regarding the movement of trains in that area, and the crew must adhere to these instructions to ensure safe and efficient operation.

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  • 10. 

    A "Block" is the length of track ________

    • Between consecutive block signals or between a block signal and the end of block system limits.

    • In ATC limits, the use of which is governed by cab signals and / or block signals.

    • Both answers are correct

    Correct Answer
    A. Both answers are correct
    Explanation
    The given correct answer states that both answers are correct. This means that a "Block" can refer to the length of track between consecutive block signals or between a block signal and the end of block system limits. Additionally, in ATC limits, the term "Block" can also be used, which is governed by cab signals and/or block signals.

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  • 11. 
    The train you are operating has passed a block signal (or distant signal clear) that governs the approach to an Automatic Interlocking at 20 mph.  How must your movement approach the interlocking?  Rule 9.1.1 / 9.9.1 - ProProfs

    The train you are operating has passed a block signal (or distant signal clear) that governs the approach to an Automatic Interlocking at 20 mph.  How must your movement approach the interlocking?  Rule 9.1.1 / 9.9.1

    • Proceed at restricted speed. The train must maintain this speed until the next signal is visible, that signal displays a proceed indication, and the track to that signal is clear.

    • Proceed prepared to stop at the next signal until the next signal is visible and that signal displays a proceed indication.

    • The train must continue to move prepared to stop at the interlocking signal until the train reaches a point approximately 1,000 feet from that signal. If the interlocking signal then indicates proceed, the train may resume speed.

    Correct Answer
    A. The train must continue to move prepared to stop at the interlocking signal until the train reaches a point approximately 1,000 feet from that signal. If the interlocking signal then indicates proceed, the train may resume speed.
    Explanation
    The train must continue to move prepared to stop at the interlocking signal until the train reaches a point approximately 1,000 feet from that signal. This is to ensure the safety of the train and any potential obstacles or hazards that may be present at the interlocking. If the interlocking signal then indicates proceed, the train may resume speed. This approach allows for cautious movement and allows the train to react appropriately to any signals or conditions at the interlocking.

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  • 12. 

    In CTC, if you pass a block signal that governs the approach to a Manual Interlocking and your speed is reduced below 10 MpH.  How must your movement approach the interlocking?   ** Rule 9.9 **

    • Proceed at restricted speed. The train must maintain this speed until the next signal is visible, that signal displays a proceed indication, and the track to that signal is clear.

    • Proceed prepared to stop at the next signal until the next signal is visible and that signal displays a proceed indication.

    • Proceed at restricted speed until the leading wheels have passed the next governing signal or the end of the block system.

    Correct Answer
    A. Proceed prepared to stop at the next signal until the next signal is visible and that signal displays a proceed indication.
    Explanation
    When passing a block signal that governs the approach to a Manual Interlocking in CTC, if the train's speed is reduced below 10 MPH, the movement must approach the interlocking by being prepared to stop at the next signal until the next signal is visible and displays a proceed indication. This means that the train should be ready to come to a halt at the next signal until it is safe to proceed and the signal indicates so.

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  • 13. 

    When moving against the current of traffic, how must a train approach interlocking and block signals?  ** Rule 6.25 ** 

    • Prepare to stop unless signals indicate proceed.

    • 25 MPH

    • Both answers are correct

    Correct Answer
    A. Prepare to stop unless signals indicate proceed.
    Explanation
    When moving against the current of traffic, a train must approach interlocking and block signals by preparing to stop unless the signals indicate proceed. This means that the train should be ready to halt if the signals ahead indicate that it is not safe to proceed. This approach ensures the safety of the train and prevents any potential accidents or collisions. The speed limit of 25 MPH is not relevant to the question and does not provide any guidance on how a train should approach interlocking and block signals. Therefore, the correct answer is to prepare to stop unless signals indicate proceed.

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  • 14. 

    If operating within limits of a Track Warrant, with Box 7 "Work Between" marked, how may a train pass a Stop indication governing an Automatic Interlocking?   Rule 9.12.3

    • At a signal displaying a STOP indication, the crew will be governed by instructions in the release box.

    • A crew must obtain verbal authority from the control operator or receive a controlled signal that indicates proceed.

    • If the train dispatcher cannot be contacted, move 100 feet past the interlocking signal, wait 5 minutes, then proceed at restricted speed.

    Correct Answer
    A. At a signal displaying a STOP indication, the crew will be governed by instructions in the release box.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 28, 2014
    Quiz Created by
    David

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