Recently my wife and I returned from Paris were we got to see a lot of beautiful architecture and art, including the Mona Lisa. Along the way we also got to ride many trains, such as the Montmartre funicular, on the north side of of the city. It leads to Sacre Coeur church.
From what I have learned, this has been the site of a funicular since 1900, but the current cars date to 1991.
Looking down from the top reveals the two cars about to pass each other. You can use a regular Metro tricket to ride this.
More about Paris trains coming.