What is the initial step to transition into ATC Bypass mode?

To transition into ATC Bypass mode, the initial step involves breaking the seal on the ATC BYPASS switch. This action is crucial because the ATC (Automatic Train Control) system is designed to ensure safe operations by enforcing speed limits and monitoring train movement under normal conditions. By breaking the seal, the operator is effectively indicating readiness to override the automatic controls temporarily, which is essential for the transition to Bypass mode.

This process requires careful consideration and is typically taken only under specific circumstances, ensuring that the crew is prepared for the implications of bypassing automated safety measures. It is important to note that breaking the seal is a clear and direct action that signifies the beginning of the transition process. Other steps, such as notifying the crew or adjusting train speed, typically follow this initial step, as they contribute to maintaining awareness and safety after switching to Bypass mode.