Guildford hasn't got an Underground system, so no underground trains.
All trains are noisy. Underground trains sound noisier because the tunnel reflects the noise back.
Yes, tourists and residents can film trains in the London Underground.
Depends what you mean: Firstly, what are 'normal' trains and why are underground trains not 'normal'? Can non-LU trains run on the tube network? A: No, they will not fit in the tunnels Does LU have an intergrated transport network with non-LU trains? Yes, sometimes on adjacent platforms
the answer is metro
Electric traction motors in each car via a "3rd rail" feeding electricity.
20m
They use the underground or the trains
Underground stations are used to catch trains. There is no point in visiting them.
Americans call them 'The Subway', the British call them 'The Underground' or 'The Tube'.
Trains are locomotives and carriage's in any Country. London is no different. There are also Underground trains in London.
Known as a subway, most operate on electrical power. Being underground they are not impeded by surface traffic.