What is the correct action when the signal displays a restrictive aspect while approaching?

When the signal displays a restrictive aspect, it indicates that the train must proceed with caution. This means the train engineer should reduce the speed significantly to ensure safety while assessing the situation ahead. The purpose of a restrictive signal is to alert the engineer that there may be an obstruction, a change in track conditions, or other factors that require careful navigation.

Maintaining a reduced speed allows the train engineer to react appropriately to any unforeseen circumstances that may arise, such as a stop signal ahead or changes in the track layout. This practice is crucial for the safety of the train and its passengers, as it allows for sufficient reaction time and control over the train's movement.

In contrast, coming to an immediate stop without assessing the situation could cause unnecessary delays or even create a hazard if the train comes to a halt in a dangerous area. Ignoring the signal would be highly unsafe and counter to operational protocols, as it puts both the train crew and the passengers at risk. Switching to manual control may not be relevant in situations where the indication is clear; the focus should be on adjusting speed in response to the restrictive signal.