metro

Asian superpower builds an 'underground transportation' system that is likened to the 'space age' that surprises the world
This is known as one of the largest subway systems in the world and shows the development stature of this country.
How does the train work?
The tram has a single slide that collects energy from the overhead line to power an induction motor.
How does the subway system work?
The subway system is simply a lot of trams running in a tunnel.
NASA: Mars is flooded with glaciers
The US Aeronautics and Space Administration (NASA) said NASA's spacecraft called
Break into the London subway system more than 100 years ago
The London Underground in England is the world's oldest subway system since it was introduced to the public in 1863. In total length, this is the largest system in the world.
China is about to have an unmanned subway
China's first unmanned drone system is expected to be put into service by the end of next year on the Beijing metro line.
Future version of British subway
London's 21st century metro version is set to be announced in the UK, with the advantage of extending 30% of the passenger space and improving the air conditioning system.