Barry Salter wrote:
Plus people actually like to be able to look out of the windows, at
least on the surface sections that make up over 50% of the LU network.

I bet they like windows even on the underground bits, as it seems to
make people feel safe if they can see their environment.

A Concorde pilot once gave a speech saying that any future supersonic
plane should probably not have windows as they produce so much wind
resistance and weaken the shell. Even the pilots could potentially do
without, opting to use cameras (which could also give passengers a view
of outside) to see.

It wouldn't happen because nobody would feel safe (even I figured the
cockpit bit might be a step too far), even though the windows aren't
actually 'useful' for passengers.

Jonathan