The "Nord Express" in the French station of Noyon - Beginning of the 20th century
Passengers from Russia had to change once in East Prussia at the German/Russian border because Russian railway tracks are of a wider gauge than those in Western Europe. In Paris there was a connecting service to the Sud Express (Southern Express) to Lisbon. This train service enabled people to travel across Europe in what was, by the standards of the time, a very fast and comfortable manner.
After World War I the train was diverted to Warsaw instead to Saint Petersburg. After World War II the "iron curtain" and air travel caused the end to this famous train. Since World War II the name Nord Express has been used for the ordinary night train between Paris and Copenhagen. In 2007 it was shortened further and diverted again such that it now runs between Paris and Hamburg, taking 10.5 hours.