It's usually called either the Underground or the Tube.
The London underground system is usually referred to as 'the tube'.
You can get an underground train and an overground train from London Bridge.
Apply to London Underground Ltd.
Train.
by a underground train
Yes, the train spotters are allowed to freely train spot in various sports of the London Underground.
In Harry Potter and the Sorceror's Stone, Dumbledore claims to have a scar above his left knee that is a perfect map of the London Underground.
london
By underground (tube).
c2c
20 mph
By underground (tube) train.