Budapest Metro in Hungary first became operational with the opening of Line 1 in May 1896. In 2002, the line was listed as a World Heritage Site by UNESCO.

Africa’s oldest underground transport system has been moving millions ... the Ministry of Transport. Cairo’s metro is one of the busiest in the world. In 2013, it was reported to carry nearly ...

Hammersmith & City and Metropolitan lines. Andrew Pollins, Managing Director of London Underground, said: "The signalling system on these lines is some of the oldest in use anywhere in the world ...

Every day six and a half million people ride Tokyo Metro's nine lines ... underground and overground rail system serving Greater Tokyo, often cited as the world's biggest urban area.

A couple of weeks ago, the Metro Collective Transport System (STC) reported in a statement ... we must remember that Line 1 of the metro is the oldest of the 12 that make up the network.

Kiev's three lines cut across the city, serving its almost three million residents, and the system is home to what is claimed to be the world's deepest subway station, almost 350 feet below street ...