I bet when you hear that something is passing through clouds your first thought is an airplane. Not this time! An SLB/CargoServ trio of Siemens Tauruses descend down toward Tarvisio to couple up their train and pull it back to Salzburg. I took the photo at Pfaffenberg-Zwenberg viaduct: 377m long, 100m high. The track lays about 1000ft above the valley floor so it's normal that trains run in the fog and clouds all the way on the hill route when bad weather.