London Overground and TfL Rail toilet facilities are already free of charge.
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Passenger trains usually have toilets, and the on-board lavatory takes many forms. The simplest train toilets are those called Drop Chute Toilets or Hopper Toilets.
The overground are more traditional trains as opposed to the metro style for the Underground. Overground is more of a ring around central London - it's useful for avoiding going via central London if you don't want to. The Overground doesn't go anywhere near Heathrow.
London OvergroundIt's in the name. As Tube lines travel underground, for at least a portion of the line, these wouldn't count either. The Overground consists of different railway services that were taken over by TfL in the 2000's.
At the end of every carriage of China high speed train, there are usually two types of toilets. On one side you can find the Chinese-style toilet - squat toilet and on the other side, you can find the western-style toilet, complete with seat and lid.
Most trains have toilets, but some operating on suburban services do not, as they are used for short journeys on busy lines where a toilet would take up too much space.
An aeroplane toilet uses a vacuum system along with a blue chemical that cleans and removes odours every time you flush. The waste and blue cleaning fluid ends up in a storage tank under the floor, in the very back of the cargo hold of the aeroplane.
Officials said there were currently no plans to operate the locomotives sans drivers on the London Underground, and that the trials are simply a 'futureproofing' exercise. A switch to automated trains would require huge changes to the tube's infrastructure, including new computerised signals.