Coventry Light Tram

In the centre of England, In the small English city of Coventry, they are currently developing a small single car battery powered tram system called CVLR (Coventry Very Light Rail). 

The idea is to obtain a tram rail network without installing overhead power lines or reinforcement in the road. They simply bolt the steel rails to the ground and the tram powers itself until it needs charging. 

They are obtaining a rail network at a small fraction of the cost. 

According to their reports they want to have the new tram system installed across the whole city. 

London Underground

The Metro rail system in London is largest in the world when the overground network is also considered. 

The standard tube network alone consists is of 402 km of railroad. This makes it the 3rd largest in the world. 

There is also a large overground network throughout London. 

There are many instances when a street will have two train stations on it with a 5 to 10 minutes walk between them; Places like frogmore and Eastcoat. 

Plus there are trams and lite robotic trains(DLR). London is so crammed with trains that there is always a station nearby.