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5. Safety was always one of the main concerns of London transport. In spite of the feet that trains often follow each other within seconds, it is said that the London Underground is the safest form of transport in die world.

Automatic signalling is operated by the trains themselves. A programme machine controls routes: if changes are necessary, they are made automatically and with lightning speed. No accidents can happen through human weakness.

New automatic driving systems are now being used The air in the Underground is changed every quarter of an hour, and the temperature all year round is maintained at 69-79 degrees Fahrenheit.
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