Yeah I understand why that would be the main path, but I think there should also be a quicker connection up.^most likely done as part of accessibility; parents with strollers, bicycles, others with mobility issues. But you're right, the majority of able-bodied folk will shortcut and they should have planned for that from the get-go.
No; my friend who works at the city says the two stations on either side are too close to justify bringing this one online, plus that tight squeeze would be hard to accommodate given the size of the "blocks" that each train occupies (with the fixed block control system). Plus that'd have to be part of the Capital/Metro lines, which use that tunnel. The Valley Line is above ground and has a different train style (low floor instead of high floor).
There’s probably no point getting up to 60 just to slam on the brakes cause there’s a considerably sharp turn not too far aheadTrains should always be set up to move faster, not slower than traffic. I don't know why the speed limit is 45, but it seems really slow.