New S-Stock Power Feed Receptacle Boxes.

The shed supply changeover switch is a three position switch located on the HV box at the side of the shed supply receptacle.
The three positions for the switch are as follows:
OFF
In this position the train is isolated from the traction current collector shoes and the shed supply.
It is the only position that allows the insertion and removal of a shed supply lead.
TRACK
This is the normal operating position for the switch when the train is in service. In this position the train draws traction and auxiliary converter power from the conductor rail. Also in this position the switch handle acts as a guard to stop the shed receptacle cover from being lifted.
NOTE – With the shed supply changeover switch in the TRACK position, all shoe gear and the shed socket, on each car, will be live when any pair of positive and negative shoes, on that car, are in contact with the live conductor rails.
SHED
In this position the train draws traction and auxiliary converter power from the shed supply, and locks the shed lead in position. The collector shoes are isolated from the supply.
Upon activating a cab, with the shed supply connected to the train, the Train Operator will receive an audible alert and a message on TCMS to advise that the shed supply is still connected. If the train is then subsequently moved, the 'motoring on shed plug' alarm will sound when the train is in RM.
When the collector shoes, on the half of the train to which the shed supply is connected, come into contact with the live conductor rails, the emergency brake will apply and TCMS alert is given.
NOTE – The cooling fans for the MCMs are powered by the 400v supply from the ACM. Therefore, if the shed supply is connected to the MS car to move the train out of the depot, the two MCMs driving the traction motors will not be cooled. This will result in traction being lost, but only after a period of continuous motoring.