What is the normal position of a main track switch?

The normal position of a main track switch is lined and locked for movement through on the main track. This configuration is crucial for maintaining the safety and efficiency of rail operations. By having the switch in this position, trains can move seamlessly on the main line without encountering unintended switches that could divert them from their intended path.

In this setting, the switch is not only aligned for the main track but also secured to prevent any accidental movement. This is essential for ensuring that trains operate safely at speeds necessary for mainline traffic. Ensuring that switches are in this normal position helps to avoid collisions and derailments that could occur if a switch were lined incorrectly.

The other choices represent scenarios that would not be considered normal operational positions for a main track switch. For example, an open position for switching activities may be appropriate for yard operations but is not suitable for mainline traffic. The non-derailing position is typically a specific setting used with equipment that requires special handling, while a switch being closed for repairs would indicate it is not currently in use, which is not the normal operational state.