What is a metro?
AnswerAn urban rapid transit rail system
Metro systems move people quickly within cities.
Travel · Facts & stats
Metro facts & stats
7 fact-checked facts about metro and subway systems around the world, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
The announcement "Mind the gap" is famous on which system?
AnswerThe London Underground
It warns riders about the gap between train and platform.
Going deeper
What is the third rail for on many metro systems?
AnswerSupplying electric power to trains
Trains draw power from the electrified third rail.
Which Tokyo station is often cited as the world's busiest by passenger numbers?
AnswerShinjuku
Shinjuku handles millions of riders a day.
What is a metropolitan area?
AnswerA city plus its surrounding suburbs
Metro areas include the linked communities around a city.
Expert level
In which year did London's first underground line open?
Answer1863
The Metropolitan Railway opened in January 1863.
Who designed the famous diagrammatic London Tube map in the 1930s?
AnswerHarry Beck
Beck's map ignored geography for clarity.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round