What is the normal position of switches connecting any track to a siding?

The normal position of switches connecting any track to a siding is lined and secured for movement on the siding. This means that when a switch is in its normal position for a siding, it is set to guide trains or equipment onto the siding track safely. This configuration allows for the efficient management of train traffic, enabling main track movements to proceed without interference while also facilitating access to the siding for loading, unloading, or other operational activities.

In the context of railway operations, siding switches need to be correctly positioned to ensure safe transitions between main tracks and sidings. When they are lined for siding movement, it not only protects against potential derailments or collisions on the main track but also allows trains to occupy the siding as intended.

The other choices do not reflect the standard operational protocol for switches connecting to sidings. The position that would suggest they are lined for main track movement would compromise safety and operational efficiency by potentially allowing conflicting movements. Ensuring switches are lined and secured specifically for siding use is vital for maintaining a well-organized and safe transportation network.