Which system is associated with the rule number ANSY500?

The rule number ANSY500 is associated with the Train Order System, which is a method used for managing train movements and ensuring safety on the railway network. This system facilitates communication between the train crews and control centers, allowing for the issuance of orders regarding train schedules, routes, and any necessary changes.

In this context, the Train Order System is particularly important for ensuring that trains can operate safely and efficiently, especially in areas where there may be limited signaling infrastructure. The procedures defined under ANSY500 provide specific guidelines for how train orders are formulated, transmitted, and acknowledged, thus enhancing operational safety and reliability on the railway.

While the other options pertain to various processes and systems in railway operations, they do not align with the specifics laid out in rule number ANSY500. For instance, Manual Block Working relates to allowing trains to occupy sections of track under manual control, and Special Proceed Authority pertains to special permissions granted when normal protocols cannot be followed. RVDS, or Radio Voice Dispatch System, involves communications technology but is not directly linked to the rules governing train orders.