If it works and one train can push the dead inbound train off the bridge (or rather, down the tracks to the next station), should mean some relief for people stuck in a train in the sun with no air conditioning on the hottest day in eight years. If not, they could always make a break for it. Unfortunately, that would do little for people waiting in sweltering stations - or the trains behind the trains on the bridge, such as JJ Leslie, who tweets:
I am stuck on a train behind the disabled RL train. In the station at Central. People are getting very angry. Bad feeling.