A bigger benefit than cost savings with the workforce would be higher reliability of service. With the Tube in London delays with driver changes often cause the

A bigger benefit than cost savings with the workforce would be higher reliability of service. With the Tube in London delays with driver changes often cause the trains to be held up significantly. TfL don't suffer the external costs but the costs of one driver are insignificant compared to five minutes for 500 passengers on a train, day in day out.