Re: windscreen wipers?
>> Why even have windows?
The first London Underground trains didn't have window panes for this reason. It was felt that since there was nothing to look at while passengers were in a tunnel, and given that in those days there were guards and porters to help people on and off at each station, windows were unnecessary. Go to the London Transport Museum and sit in one: it's like being locked inside a communal wooden coffin. Nor do you experience any relief when arriving at a station. Passengers hated it.