Escape The Unfinished Rail

You eat as always to work in the underground, as it is the only transport that is not afraid of traffic jams. As always, you have come to the station near your home and wait for the train, but in the one you choose to look down. You saw the damaged track and out of the tunnel hear the sounds of the approaching train. Time is tight and you need to find a way to fix this damage yourself, since you're an engineer, or a train gets into an accident.