Is it true that Rule 100 relieves a train from flagging against both opposing and following movements on the same track?

The correct interpretation regarding Rule 100 is that it provides specific guidelines on flagging requirements for train movements. This rule typically allows a train to be relieved from flagging against following movements only, meaning that when a train is stopped or disabled, it does not need to flag an approaching train that is on the same track coming from behind. However, it does not extend this relief to opposing movements, which still necessitate flagging procedures as a safety measure. Therefore, the option stating that the rule only provides relief from flagging for following movements accurately reflects the intent and application of Rule 100.

In essence, while trains might not need to flag against following movements due to Rule 100's provisions, they are still required to flag for any trains that could be approaching from the opposite direction on the same track. This ensures safety and communication between train crews during operations.