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Access to CBTC (Communications-Based Train Control) Mainline territory is signaled by the specific signal designed to indicate that a train can enter this area where CBTC operations are taking place. This signal ensures that trains operating in automated CBTC zones are correctly authorized to enter, prioritize safety, and maintain operational integrity. It coordinates the seamless transition from conventional operation to automated control, a critical function in train management within CBTC environments.

The last station's exit signal might indicate a departure from a station, but it doesn't specifically denote entry into CBTC Mainline territory. Similarly, the end of Yard territory signal indicates the boundaries of the yard and not the transition into the mainline operating environment. The safety override signal typically allows for manual control during automated operations but does not specifically grant access to designated territory. Thus, the dedicated signal for accessing CBTC Mainline territory serves a unique and vital role in maintaining the safety and efficiency of rail operations.