When rounding sharp curves, what is a critical factor for a train’s speed?

When rounding sharp curves, track stability is a critical factor for a train's speed because it directly impacts the safety and integrity of the train's operation. Sharp curves introduce lateral forces on the train and the track, which can lead to derailment if the train travels too fast. Maintaining the correct speed on these curves ensures that the forces exerted on the train are within safe limits both for the vehicle's design and for the track structure.

Track stability refers to the ability of the railway infrastructure to maintain its alignment and structural integrity under the dynamic loads exerted by the train. If the train exceeds the safe speed limit while navigating sharp curves, it increases the risk of track displacement, which is particularly dangerous. Ensuring that the train operates at a speed that is compatible with the curvature of the track helps prevent accidents and ensures a smooth ride.

While factors such as passenger comfort and neighboring train speeds may influence operational decisions, the primary concern when it comes to safety and operational integrity on sharp curves is the stability of the track itself. Weather conditions can also play a role, but they are secondary to ensuring that the track can withstand the stresses imposed by the train's weight and speed on curves.