I used to take the train everyday out of London (SW trains). As an optimisation geek I wanted to know the fastest way to get the doors open at the station. If y

I used to take the train everyday out of London (SW trains). As an optimisation geek I wanted to know the fastest way to get the doors open at the station. If you just keep the button held down from before you arrive into the station the door will open as soon as the conductor flips the switch. Though there's a weird awkward social thing, because you know the people behind you are staring at you thinking "take your finger off and push it again and the doors will open, idiot!" I go through pedestrian crossings regularly when you absolutely need to push the button or they never trigger. You can tell if someone hasn't been through for a while because the crossing changes straight away.