Question

How many lines does the Paris métro system have? Are you familiar with any other subway systems in major cities? If so, how does the Paris métro compare?

Answer 1

Paris Métro has 16 lines but also RER (Réseau Express Régional) system which is tightly integrated (easy transfers) into the subway system. Similar systems exist in almost all European major cities like London, Barcelona, Madrid, Berlin, Munich and countless others.