Which color signal indicates "Stop" and other prescribed uses?

The red signal is universally recognized in rail operations as indicating "Stop." This is a critical safety measure, as it communicates to train operators that they must bring their trains to a complete halt. The color red serves as a clear and distinct signal that alerts engineers to stop due to various possible reasons, such as an obstruction on the tracks, an upcoming signal that is set to proceed with caution, or other operational directives.

In terms of prescribed uses, red signals are often employed in conjunction with other signals that might indicate specific instructions or conditions ahead, fully aligning with safety protocols and procedures that ensure trains operate without hazard. This vital role of red signals in train operations underlines its importance in maintaining proper system functionality and safety compliance, making it a fundamental component in the training and operational guidelines of the Long Island Rail Road and similar rail systems.