A secured interlocking appliance is defined as one that has been:

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A secured interlocking appliance is defined as one that has been electrically disabled and mechanically locked. This definition emphasizes the importance of ensuring safety and preventing unauthorized operation of the appliance. When an interlocking appliance is electrically disabled, it means that it cannot be operated unless power is restored, which is critical in maintaining control of train movements and minimizing the risk of collisions or derailments.

Additionally, the mechanical locking further enhances safety by physically preventing the appliance from being moved or manipulated. This dual-layer of security is essential in railroad operations, where the consequences of malfunction or human error can be severe.

The other choices do not meet the criteria for securing an interlocking appliance effectively. Temporarily disabling it does not provide the same level of control and safety assurance, while blocking it with an approved device or leasing it to an external employee does not encompass the comprehensive safety measures inherent in being both electrically disabled and mechanically locked. This underscores the importance of understanding the specific safety protocols and definitions within locomotive operations.

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