For those who haven't seen the plans I've pasted a link here to a consultation page regarding the proposed Silwood sidings to accommodate 5 car 378's in 18 months time. It's envisaged that Silwood will berth units that will depart to the south and the existing depot will predominantly berth those that will depart north. Units will still be washed at the existing depot.
https://consultations.tfl.gov.uk/rail/silwood
There is a pdf link at the bottom of the document showing a map of the proposed sidings and buildings.
https://consultations.tfl.gov.uk/rail/silwood
There is a pdf link at the bottom of the document showing a map of the proposed sidings and buildings.