Finse is almost exclusively accessible by train by the OsloâBergen railway.
The Oslo-Bergen railway is operated by the Norwegian State Railways (http://www.nsb.no/). If you buy your ticket online well in advance, fares may be as low as kr. 199 for a one-way ticket. For an additional fee of kr. 75 you may upgrade your ticket to NSB Komfort, the equivalent of first class, with slightly better seats, free coffee and tea, power supply and a more quiet spot in the train.
Usually there is a special wheelchair-accessible on the trains between Oslo and Bergen. A reservation is recommended. The train staff will assist you to get the wheelchair on board.
Alternatively, access Finse from Haugastøl by bike in the summer on Rallarvegen Navvies' Road, the trip is approximately 27 km of steadily climbing difference in altitude is 234 metres, or by ski in the winter.