Eventually took the train to Gryon. Window view:
Got out for a run towards 3pm, which meant that the sun appeared below the upper cloud level when I was up on top of the Chaux. Pretty!
As always, taking the train up out of the fog is magical.
I had intended taking a slightly different route, continuing along the Chaux ridge for a little bit, before contouring and dropping. The way I went was a bit less sketchy given it was sunset and I no longer had a map.