What is the highest speed allowed under Medium Speed for passenger trains?

In the context of railroad operations, medium speed for passenger trains refers to a specific range of train operations where safety and efficiency are prioritized. The highest allowed speed in this category is defined as 30 miles per hour. This speed is crucial for maintaining safe stopping distances while ensuring that trains can operate effectively in areas that may have more frequent stops or curves. Understanding these speed limits helps conductors ensure compliance with safety regulations and minimizes the risk of accidents.

In this case, the other speeds presented do not align with the established guidelines for medium speed. Higher speeds could compromise safety in zones where medium speed is recommended, while lower speeds would not fully utilize the operational capabilities of passenger trains in appropriate settings. Thus, 30 miles per hour serves as the correct maximum for medium speed.