What indicates the mode change boundary for movement into CBTC Mainline territory?

The indication of a mode change boundary for entering CBTC (Communication-Based Train Control) Mainline territory is marked by a signal that provides access to that territory. This signal specifically serves as an authoritative cue for the train engineer to understand when it is permitted to transition into CBTC control.

When approaching the boundary, the signal will indicate the status of the system and whether the train is allowed to switch to CBTC mode. The CBTC system relies on precise signaling to maintain safety and efficiency on the tracks, and thus, this type of signal is crucial for ensuring that the transition into CBTC Mainline territory happens at the correct location and under the right conditions.

This approach promotes the seamless integration of train operations with the overall signaling and control systems in place. It ensures that the engineer is informed and prepared for the operational change facilitated by entering the CBTC Mainline area.