What must a train on an adjacent track do when it receives notification of a train stopped ahead?

When a train on an adjacent track receives notification of a train that has stopped ahead, it is imperative for safety reasons to stop short of the stopped train's fouling area. The fouling area is defined as the space that, if occupied by a train, would intrude upon the track of the stopped train, potentially causing a collision or other dangerous situation. Stopping in this manner helps to ensure that there is a safe distance maintained between the two trains, thereby reducing the risk of accidents.

Stopping short of the fouling area allows for procedural checks and ensures that all safety protocols are being followed. This action is crucial not only for the safety of the crew and any passengers but also protects the integrity of the rail system and prevents further incidents from occurring. Operating at full speed, proceeding without stopping, or moving at maximum speed until cleared could result in dangerous scenarios where collisions could happen, thereby violating rail safety regulations.