Interlocking Limits Quiz - 15 Questions

An interlocking refers to signal appliances that are interconnected in a way that ensures each of their movements follows a proper sequence. This can be achieved through manual or automatic operation. The correct answer accurately describes the concept of interlocking, where the movement of each signal appliance is coordinated to maintain proper sequencing.

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.

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.

Before changing direction, the crew must obtain permission from the control operator.

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.

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.

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.

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."

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.

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.

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.

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.

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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