At dawn, the first train of the Bernina Line pulls a light trail through the panorama curve of Alp Grüm. At the left edge of the picture, about 400 metres lower, you can see the light track that the train had drawn 13 minutes earlier while crossing the plain of Cavaglia (double exposure).
A continuously growing album of photos that IMHO reveal the awesome and seldom-seen beauty of the railroad world from the dimming of day to dawn's early light! From dusk to dawn, trains roll on! (I'm still finding gems of sunset-to-sunrise surprises!)