In Europe, the underground train network is called the metro. This same type of underground system in the United States is called the subway.
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Today only four German cities (and Vienna in Austria) have underground/metro (U-Bahn) lines: Berlin, Hamburg, Munich, and Nuremberg. A few cities, such as Cologne, Hanover and Stuttgart, have light-rail (Stadtbahn) trains that sometimes run underground, but these are not true underground subway lines.
THE world's first metro, now the world's oldest system, is the London Underground in England, which is more commonly known as the Tube, which was opened in 1863. At 402 kilometers in length the London Underground is also the world's second longest metro system.
The RER is now just called the Train. Lines A, B, C, and D are a high-speed urban system that goes further outside than just central Paris. If your stops are on the RER/train line, it is a much faster option than the Metro, but it has fewer stops.
In Paris, the Metro moves people around the city centre; the RER and Transilien ferry them in from the suburbs.In London, though, there's no such division: the Tube plays both roles. The Central line, say, acts like an RER route in the Essex suburbs, but a Metro route in Zone 1.
Using Uber in Paris is a good option in many situations, even if you're on a budget. Between the airport (CDG) and the center of Paris Uber turns out to be cheaper than RER tickets for 4 people, and it's also a lot more pleasant.
Weekdays, the metro operates from 5:30 a.m. to about 1:15 a.m. On Friday and Saturday evenings, as well as on the day before a bank holiday, trains run until about 2:15 a.m. The RER operates daily from 5:30 a.m. to about 1:20 a.m.
Subway System Ranked: Best to Worst for PassengersThe Seoul Subway in South Korea topped the list. The overall ranking takes into account every element of our study - so that includes the number of stations with step-free access, the price of a ticket and the age of the system (amongst many others).