But of capacity would be worse than today.
Let's consider the hourly Wigan to Alderlwy Edge service as an example. Do you
A) Keep it as a Wigan-Alderley Edge service but have it service Victoria in one direction and Piccadilly in the other (so a half loop path in each direction), or
B) Operate two seperate Wigan-Manchester and Manchester-Alderley Edge services...which needs two complete loop paths, or twice as many a (A)?
A) I think would be best. E-W trains would generally run through Victoria, W-E trains through Picadilly; some would serve both.
I think it would have a "circle line" running anticlockwise on the innermost tracks, so that would give ways around the loop both ways.