What function do train markers fulfill in railway systems?

Train markers play a crucial role in enhancing safety and operational efficiency within railway systems. Specifically, they help identify trains, which is essential for maintaining proper separation between them. This identification process is key in preventing collisions, as it allows railway operators to track the movement and position of multiple trains on the same network. By providing information on train locations and ensuring that trains are distanced appropriately, train markers are integral to avoiding accidents and ensuring a smooth flow of rail traffic.

The other options do not accurately reflect the primary function of train markers. While they might serve auxiliary roles in certain contexts, the core objective remains focused on safety and avoidance of collisions.