When you’re on the railroad between Oslo and Kristiansand (which goes to Stavanger as well…), you can get a glimpse of Drammen. I did, both when I was traveling to and from Oslo in early February of 2014. Looking across the river Drammenselva to see more of Drammen as the city covers both sides of the river. It was a beautiful sight.
Here is a link to the website called “Tourist in the river city of Drammen” that describes the city and some of its history.