A little medieval town
"easily reachable by railway"
Unless you study engineering/informatics, chances are you won't be going to Crema. It's not so famous as its neighbor Cremona and it's quite little. Yet, if you have a bike there are several nice routes. And if you would like spending an afternoon walking in a medieval town, it's not a bad choice either, as the churches are quite notable. Especially the Duomo, with its "wind facade" (I think it's called like that because the wind can pass through its openings) full of allegorical images.