the next two cities to build rapid transit lines were budapest, hungary (whose first metro line opened in 1896) and glasgow, scotland (whose "subway" also opened in 1896). soon, many other big cities in europe were building metro lines of their own, such as berlin, germany (berlin u-bahn); paris, france (paris métro); and moscow, russia (moscow metro). a number of paris métro lines use trains that have rubber tires along with wheels made of steel; this helps the trains run better and smoother especially on steep gradients. montreal's metro system is also like this, along with some people mover systems, which carry fewer people than rapid transit.