Having built the deep retaining walls, they're now excavating the big underground "box" which will be the starting point for the tunnelling machinery later this year - they've also set up the travelling crane that will remove a few kilotons of soil as the tunnel is built, but I don't think it's ready for use yet, I think they have to lay more track or something. At the moment the view from my flat is a bit dull, I think that for the next couple of years most of the activity will be to the East and West, not directly opposite.
More (sporadically) as it happens.
Later = I was wrong about the big crane, it's moved a couple of times today though I haven't seen it lifting anything. I was also wrong about nothing much happening opposite me - there seem to be several excavators in the "box" area now. I think that as they go deeper most of the soil will be coming to the surface there, to be loaded onto trucks. I really don't understand why getting it out by rail isn't an option, presumably it would disrupt the railway too much.