This game is fantastic. I mean, addicting. The premise is simple enough that most kids or teenagers can easily catch on and any adult will find it fun and interesting. If you haven't played any Ticket to Ride games, the premise is that you claim tracks between cities to complete various routes, while other players are doing the same thing for different routes.
The Europe edition is different from the debut US edition in that it: (1) uses a Europe map, obviously; (2) adds ferries, requiring one or two locomotive cards to cross water; (3) adds tunnels, meaning a section of track in mountainous areas could cost up to three extra train cards; and (4) adds train stations, which allow you to "borrow" someone else's track between two cities to complete a route. These changes are all for the better, I think. They make some tracks more challenging or more of a gamble to acquire, and they allow for a means to complete routes even if other players block one of your destination cities.
There are so many different strategies you can use and so much variation each time the game is played that it takes a long time for this game to get old. Each game lasts anywhere from 30-60 minutes, so it's not a huge time commitment, but is a lot of fun. One of the best games to come out in the past ten years. Strongly recommended!