I have made the train journey from Oslo to Bergen and can testify that the scenery is truly breathtaking and that the comfort of the first class carriage is unparalleled. I am not sure I would want to re-live it in realtime HD but if that sort of thing floats your boat then the Norwegian Broadcaster NRK have now made it possible.
It's all here: http://nrkbeta.no/2009/12/18/bergensbanen-eng/