Unable to break Bodily_harm through the besieging army , Boiditzes , the commander of the breached section privately attempted to negotiate Communication with the Caliph without notifying his superiors .

On receiving a train approaching signal notifying him of the approaching the express , he realised Know his mistake , but he was only able to alert the freight train by red flag and although it braked Self_motion to a halt , it could not be cleared from the up main line in time to avoid the collision .