What is required to return to normal operation after accepting a call-on?

To return to normal operation after accepting a call-on, it is essential to wait for the Trainmaster's permission and the 'CBTC Available' indication. This procedure ensures that the train engineer has received official clearance and verification that the necessary safety systems, such as the Centralized Train Control (CBTC), are fully operational.

Waiting for these confirmations is crucial for maintaining safety protocols and operational efficiency. The Trainmaster's approval indicates that it is safe to proceed, while the 'CBTC Available' indication ensures that the automated systems controlling the trains are functioning properly, reducing the risk of accidents or operational failures.

In contrast, other options would either compromise safety or violate operational protocols. Moving without permission could lead to unsafe conditions, and notifying passengers is important for transparency but does not substitute for the need for operational clearance. Rapidly increasing speed before proper indications could also lead to dangerous situations.