It turned out that the train was probably the only way we were able to see Kjosfossen because we actually tried to make an attempt to drive to this waterfall when we were essentially stopped short at Blomheller (the half-way point to Myrdal). It turned out that I think private vehicles could continue to some farms, but the road was so narrow and was being shared with lots of walkers that we didn't feel comfortable in going further (heck, we weren't even sure vehicles were supposed to keep going beyond Blomheller). All things considered, we weren't even close to an independent self-drive to Kjosfossen, and perhaps with hindsight being 20/20, we could've done something like parking the car at Blomheller, taking the train to Myrdal, then walking back to Blomheller. Or for a less complicated way of doing it, we could've just taken the train one-way all the way to Myrdal and then walked all the way back to Flåm (that would've taken all day as I think it's about 22km each way).

Kjosfossen is sourced by Reinunga Lake (Reinungavatnet), which we were able to see from the train. So I think this waterfall flows quite reliable year-round unless the power lines we noticed were indicative of this waterfall being regulated (which we couldn't really tell).

Directions: The train station for Flåmsbana is within the town of Flåm, which is at the head of Aurlandsfjorden (one of the arms of Sognefjorden - the world's longest fjord). It's about 58km from Voss (29km east of Stalheim) and about 7km south of Aurlandsvangen along the E16.

Once nearby Flåm, E16 junctions with Rv50 near the west end of town. A signed turnoff leads you south, which in turn leads to an intersection. Turn left at this intersection, then turn left again at the next intersection to head north to the Flåm Railway station. At the station, there is a large complex where we could buy food, buy railway tickets, and get questions answered at the visitor centre.