How does a switch machine function in railway operations?

A switch machine plays a critical role in railway operations by moving the switch points or a derail between positions. This action is essential for directing a train from one track to another, allowing for safe and efficient routing of rail traffic. The switch machine ensures that the points of the switch are properly aligned with the track that the train will be moving onto, preventing accidents that could occur from misalignment.

By controlling the position of the switches, the switch machine enhances operational flexibility on the railway network, enabling trains to change tracks as needed. This function is vital during various operations including train movements, routing in yards, and managing traffic in busy rail networks.

The other options relate to different functions within railway operations. Controlling signal lights pertains to signaling systems, generating power for rail cars relates to onboard electrical systems, and monitoring train speeds involves the use of various speed detection systems, but none of these pertain directly to the primary function of a switch machine.