As you say this has nothing to do with security it is all about being seen to be doing something ijn case something happens & it is all for public consumption.
I wonder if they have airline like security checks planned for the thousands/millions of people piling into trains and the London underground dragging their cases holding god knows what?
Somehow I doubt it as the City would seize solid if they even attempted a fraction of what is expected at airports.
Yet any terrorist would have easy pickings with the railway and underground network compared to the airlines and that as was discovered was the terrorists future intent not airports.
Pace