dalat
...
White-winged Snowfinch would presumably be best at the top station though?
Not impossible up there, but I think also for Snowfinch, chances are much better at Kleine Scheidegg (2100m), or one stop higher at Eigergletscher (2300m).
I had a look at the ornitho database, but no June/July records at Jungfraujoch (3500m), and only a few in late summer..