metro

Saudi Arabia has launched the Riyadh Metro driverless metro system, which can carry 3.6 million passengers per day when completed.

This is known as one of the largest subway systems in the world and shows the development stature of this country.

The tram has a single slide that collects energy from the overhead line to power an induction motor.

The subway system is simply a lot of trams running in a tunnel.

The US Aeronautics and Space Administration (NASA) said NASA's spacecraft called

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's first unmanned drone system is expected to be put into service by the end of next year on the Beijing metro line.

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.