They are comically old cars, some you have to open by flipping a lever down with a snap (and from inside you can actually open the door before the train comes to a complete stop). And they are color coded in weird secondary colors like light yellow and slightly darker yellow as well as a light green yellow line. I am talking of course about the Metro which whiz below Paris with open windows that alllow for an impressive breeze. We had our struggles today and a couple times the train let us down (note: not every connection is clearly marked). But oh the places it took us. Paris for us was not love at first sight but we are now officially smitten.