How can a train legally pass a fixed signal that indicates 'stop'?

A train can legally pass a fixed signal that indicates 'stop' only with authorization via specific signals or orders. This means that under certain controlled circumstances, such as receiving a form of permission from the train dispatcher or a signal indication that modifies the stop aspect, the train driver is allowed to proceed. This protocol ensures safety and communication between operations and helps prevent accidents by requiring that any movement past a stop signal be done with the proper authorization.

The importance of this rule lies in maintaining operational safety on the railways. A stop signal typically indicates that there might be a hazard ahead, such as another train or a track switch that needs to be set. The authorization process allows for a thorough check of the situation before proceeding, focusing on minimizing risks.

In this context, reversing the direction of the train, having no other trains in the vicinity, or a manual override of the signal are not acceptable methods to pass a stop signal, as they could lead to unsafe situations or violate established operating protocols. Thus, emphasis is placed on the need for explicit authorization before any movement can legally occur past a stop indication.