Mother Nature has forced us to change plans.
At Oslo Sentralstajon on board the 8:25am train to Bergen: the conductor just informed the train that, due to a recent avalanche, the bus route that connects Gundvangen to Voss is CANCELED.
They offered a couple of solutions. Skip Flåm altogether and continue on straight to Bergen.
Or, take the Flåmbahn rail from Myrdal to Flåm...then eventually double-back, reversing the route from Flåm to Myrdal, rejoining a direct train to Bergen.
I don't know yet, but I assume the ferry from Flåm to Gundvangen is still running. You'd just stay on for a round-trip back to Flåm.
I suppose there is one other solution: from Flåm take the long passenger ferry to Bergen. I think this runs once a day. I'm not sure and will find out more. If anyone knows this route, please respond.