When encountering a train in emergency on an adjacent track, how must an opposing train proceed?

When encountering a train in emergency on an adjacent track, the proper procedure for an opposing train is to proceed at restricted speed. This is crucial because restricted speed allows the train to control its movement more effectively in potentially dangerous situations, ensuring that the crew has sufficient time to react to any unforeseen circumstances or obstacles.

By operating at restricted speed, the opposing train can stop within the range of visibility, which is essential in case the emergency situation is more severe than initially apparent. This precaution helps to enhance safety for both the crew of the opposing train and those involved in the emergency situation. It also allows the train engineer to maintain awareness of any conditions on the adjacent track, which may change suddenly, necessitating immediate action.

Normal speed would not allow for this level of safety, as it may not permit adequate reaction time to any sudden developments. Slower speeds, such as half the speed limit or stopping, could technically achieve safety but do not adhere strictly to the established protocols that ensure the maximum level of caution in the presence of an emergency. Therefore, proceeding at restricted speed is the most appropriate and effective response in this scenario.