In the event that the propulsion system of a car fails, the remaining motor car of the train will still provide sufficient traction effort, probably in reduced I , for the train to draw into the next station platform for alighting of E . The empty train can be stabled temporarily at a D or at a B or returning back to the depot if the failure occurred close to the depot. A H will be launched from the depot to take over the rest of the runs of the defective train.