What is the purpose of the running rail in train operations?

The running rail serves a critical role in train operations by supporting the weight of the train. Trains are designed with wheels that fit precisely onto the grooves of the running rails, ensuring stability and allowing the train to move smoothly along the tracks. This design is fundamental to the structural integrity of the railway system, as the rails must bear the heavy loads of the train cars and ensure that they remain on the track while in motion.

In the context of rail operations, each rail in the track system is engineered to handle specific weight limits and stresses caused by the train’s movement. This weight distribution minimizes the risk of track deformation or failure, thus maintaining safety and efficiency in train operations. The running rails also play a vital role in rail alignment and tracking, which are essential for preventing derailments and ensuring safe travel for passengers and cargo.

Other functions mentioned in the options relate to different components of the railway system but do not accurately describe the primary purpose of the running rail.