The Piccadilly line between King’s Cross and Russell Square isn’t going to be in use for some time. Neighbouring stations are likely to also be somewhat screwed by dust and smoke, so keeping them closed for now seems entirely reasonable.
However, it seems slightly strange to start the east-of-KX service as far east as Hyde Park Corner, and the north-of-KX Piccadilly service as far north as Arnos Grove. Running one stop further west into Green Park would allow people to actually change onto and off the Piccadilly from the Jubilee and Victoria lines, making life far easier for all concerned. Similarly, running a few stops further south to Finsbury Park would allow cross-platform Victoria line interchange, meaning that the Victoria line duplicated the missing Piccadilly section – and that journeys were therefore not significantly disrupted.
Anyone got any ideas why this isn’t happening? According to this plan, Arnos Grove has an extra reversing track which Finsbury Park doesn’t, which probably explains the northern decision. But Green Park and Hyde Park Corner stations have the same track layout as each other (making it equally easy or hard to reverse/terminate trains there). Why not capitalise on this?