The top of the escalators can become very busy, whether dangerously so will be subjective.
Agreed, albeit there are (AIUI) objective elements to risk assessments, and I don’t believe it’s ever been flagged as dangerous. I can’t ever remember the station being closed due to overcrowding, for example.
I think part of the issue is that, post Covid, we’re all still getting used to seeing properly busy platforms and trains again.
Certainly the platforms should not be a "free for all" but I don't see why people for the next departure cannot be allowed on a lot earlier than they currently are to reduce crowding before the barrier - particularly when, as described in post #41, there are two trains on the same platform.
Around five minutes before departure is adequate to advertise and board a five car train on the stops, and get it away on time. Ideally longer, especially for a ten car, or a five at the north end, but this is subject to the inbound service arriving and tipping out, knowing that West Hampstead box hasn’t dropped the ball again (eg putting an inbound unit into a platform on top of a shunt, which was booked to depart first, as they did today), and that it’s coming into the correct platform.
The EMR staff have to radio the NR control room to advertise the platform, so there’s potential for Chinese whispers/mistakes there. It’s not unknown for them to put the wrong platform onto the boards, which is a bit of a face palm moment.
An issue that increasingly rears its head, as passenger numbers rise, is where a 360 tips out on p1, and the ex Nottingham 222 that has been up its chuff since Luton quietly glides along P2 with people walking dangerous close to the platform edge with their backs to it. Increasingly horns are having to be blown, which isn’t ideal inside the station, albeit somewhat amusing to do
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That the company which controls the barriers is different to the one managing the escalators should not matter at all - the objective should be to prevent unnecessary overcrowding anywhere on the station
Reasonable endeavours are already undertaken to minimise crowding, to the extent possible, via the queuing system. The station layout isn’t ideal (far too much is given over to Eurostar, as previously noted) but has to be worked around, as best as it can be.