Four speed settings were possible, three provided by the main controller, and the fourth by a weak field flag switch. Shunt mode was used in depots and yards, and was achieved by connecting resistance banks in series with the motors. In series mode, the resistance was removed in steps, until the two motors were in series between the 600 V supply.
The system had four speed settings: three controlled by the main controller and one via a weak field switch. Shunt mode was used for depots and yards, achieved by connecting resistance banks in series with the motors. In this configuration, the resistance was progressively removed until the two motors were connected in series across the 600 V supply.