What does the abbreviation "RS" followed by a number indicate in the context of speed limits?

The abbreviation "RS" followed by a number signifies the restricted speed in miles per hour that must not be exceeded. In railway operations, restricted speed is a key safety measure that ensures trains operate at a safe speed under various conditions, such as when approaching a turnout, where track conditions may be uncertain, or in areas of limited visibility. This speed limit is crucial for preventing accidents and ensuring the safety of both the train and the surrounding railway environment. Understanding restricted speed is essential for dispatchers and train operators, as it directly affects operational reliability and overall safety protocols.