What must the normal position of a main track switch be?

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The normal position of a main track switch must be for main track movement, which is typically secured or locked to prevent accidental movement that could lead to accidents. This setting ensures that trains can safely pass without encountering an unexpected switch position that could divert them onto an incorrect track.

When a switch is locked in the normal position for main track movement, it indicates that safety protocols are in place to mitigate risks associated with train operations. This is critical in maintaining the integrity of the main track, especially in areas where multiple routes may intersect or where maintenance activities take place.

In contrast, the other options do not promote safety and reliability in train operations as effectively as locking the switch for main track movement does. Setting the switch for siding movement or leaving it in a neutral position could allow for unintended diversions, posing hazards to train crews and equipment. An open position for maintenance specifically would indicate the switch is not in use, but it should not be considered 'normal' for track operations in a functioning rail yard or mainline scenario.

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