What action should be taken when approaching a flashing green signal on a curve?

When approaching a flashing green signal on a curve, the appropriate action is to stop the train as required by the Manual of Operating Rules (MAL) and wait for the Train Operator's Display (TOD) to change to a less restrictive aspect. This action is critical for ensuring safety while navigating the curve, as it allows for proper assessment of track conditions and signal indications ahead.

The flashing green signal indicates that there is a need for caution, particularly on a curve where visibility may be limited and the handling of the train can be more challenging. Stopping gives the engineer the opportunity to ensure that everything is clear and that it's safe to proceed beyond the curve before resuming travel. This precaution helps to minimize risks associated with operating at speed on potentially unclear or dangerous tracks.

In contrast, other options promote actions that may compromise safety. For instance, speeding up to clear the curve could lead to loss of control, while continuing at the current speed does not address the potential hazards indicated by the signaling system. Switching to manual control, without first assessing the situation adequately, also poses risks in such scenarios. Thus, the recommended procedure of stopping and waiting for a proper signal is the best practice for ensuring safety on the tracks.