There are good train connections to Grenland with connections to Sørlandsbanen.
Timetables for the whole of Norway
For tickets click here Bratsbergbanen
Bratsbergbanen is the railway line between Porsgrunn and Notodden in Telemark. The track connects Sørlandsbanen with Vestfoldbanen. Bratsbergbanen has frequent departures during the daytime. The entire route between Porsgrunn and Notodden takes approx one hour.