What happens if there is an October blockade in the tunnel, as is rumoured?
The last two blockades have seen no 9-cars operating east side because they can't be maintained at Ilford and the blockade prevents them returning to Old Oak Depot.
Might that final blockade be the final time the 315s are used, noting that they will see fewer workings until then? I guess 315 longevity also depends on whether 345 extension is going to take priority over 315 withdrawal.
Either way, I accept that it is apparent that 315s are now in their final days.