What type of maintenance may involve replacing worn-out brake shoes?

Replacing worn-out brake shoes is an integral part of corrective maintenance. This type of maintenance is enacted after an issue has been identified — in this case, the wear on the brake shoes that could affect the safety and functionality of the rail system. Corrective maintenance seeks to address and fix problems to restore equipment to its proper working condition.

In contrast, preventive maintenance focuses on activities designed to prevent potential failures before they occur, often involving routine inspections and servicing to catch wear and tear early. Predictive maintenance uses data and analytics to predict when maintenance should be performed based on actual condition rather than on fixed schedules or after failures. Scheduled maintenance is a planned maintenance action based on a predetermined timetable but may not necessarily address specific wear items until they fail or are reported as needing repair.

Therefore, the context of addressing an obvious need for repair due to worn components aligns entirely with the principles of corrective maintenance.