What should be done if the actual elevation and degree of curvature change due to track degradation?

When actual elevation and degree of curvature change due to track degradation, recalculating the actual cant deficiency for speed is crucial. This is because cant deficiency reflects the difference between the cant provided and the cant necessary for a train to navigate a curve safely at a certain speed. If the curvature of the track changes, the cant that was initially calculated might no longer be sufficient to accommodate the speed at which trains are operating, leading to safety issues such as increased derailment risk or passenger discomfort.

Regularly updating this calculation ensures that the track can support safe operations under current conditions. It also aids in making informed decisions regarding track maintenance and necessary adjustments. By performing these recalculations, engineers and maintenance personnel can proactively address any potential hazards stemming from track degradation, thereby prioritizing safety and operational efficiency.

The other choices do not appropriately address the need for active monitoring and adjustment that comes with physical changes to the track, making them less suitable responses to the scenario presented.