What is required before a train may make a reverse movement in the same block?

Before a train may make a reverse movement in the same block, it is required that a crew member precede the movement. This is a critical safety measure to ensure that the path is clear of hazards and that the train can operate safely in reverse. The crew member can assess the conditions ahead, providing an additional layer of safety during this maneuver, which typically involves heightened risks compared to forward movements.

The other options, while they may pertain to general operating procedures or safety considerations, do not specifically address the requirement for making a reverse movement. For instance, obtaining permission from the dispatcher could be essential in certain contexts but is not universally applicable to all reverse movements. Similarly, having all signals green could indicate that it is safe to proceed, but does not inherently address the need for a crew member's oversight. Normal speed applies to operational concerns but does not capture the crucial aspect of verifying safety through a crew presence when moving in reverse.