Is there a rough date for the winner of the bid to make the new trains for SE? Have they announced the classes like Northern did? I assume Northern are in a similar situation with their announcement?
Southeastern are further ahead than Northern. Southeastern have already submitted their business case, Northern from public tenders wouldn't be in a place to do that. Their depot upgrade feasibility works aren't completed and would be one of the prices needed for their business case. No class number has been announced for Southeastern, that can happen while the fleet is being built.
Would still need something for the Bromley North shuttle and I doubt SE want a new microfleet.
Whatever new train is ordered would have bodyside cameras one of the blockers for using other fleets on Bromley North currently. 4-cars is ideal, but could be 5 or 8 if didn't have 4s to run it.
Where are the 12 coach sidings on the Southeastern network? I think there is 12-coach capacity at Grove Park, but where else?
The Grove Park complex is all 12-coaches. Other locations that all 12 are Orpington and its sidings, Charing Cross (with SDO) and Cannon Street. Slade Green depot is a mix, it has several 12-coach roads and one of the existing 12-coach trains starts from there.
On the London Bridge metro routes the places that aren't are Plumstead, Slade Green Up sidings, other parts of Slade Green depot, Dartford sidings and Gillingham depot.
With the new fleet there would be the potential for a lot more 12-car running. I doubt there is the money or stabling capacity to go to maximum lengths for all services or even maximum and the 707/376s. Will be interesting to see what the lengths and quantities are when an order is finally announced.