Building a plane in 10 days. This is 7th day. A different view of the plane under construction. By the way, the Paris Metro is cleaner, quieter, prettier, and easier to use than the NYC subway. The cars ride on tires, with horizontal tire bumpers to minimize swaying.
Stations are well marked with regard to exit locations and train destinations.
In New York, the subway cars are mostly air conditioned. In the summer, in Paris, count on sweating.