Loco 650 by Viafier retica (RhB) passed with a test-train Naz above Bergün in the evening of 14th of June 2005. If you check the web-cam of RhB, you'll see that it drove up and down the Albula-line the whole day. This train could be recognized by the measurement cars in rainbow coloures: On 14th of June it was the third and fourth into the consist when the train drove to Bergün (down) and the 11th and 12th in direction Albula-tunnel. 
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Photo by Arnim v. Herff (arnimvherff@uni-duisburg.de)