Was on the train (hudson line) toward poughkeepsie, sometime between croton-harmon and cortlandt. looked out the window and saw 3 objects in the sky across the river from me. they were definitely not on the window, as i could no longer see them after the train rounded a bend. they did not look like clouds, as they didn't reflect the sun the same way as the other clouds. at first i thought they were trails from planes, but they stayed stationary for at lesst 15 minutes. they looked like they reflected light to me, but i'm not sure. i tried to get photographs, but they were far away and the train was moving fast. i could only get photos of 2 of them in the same picture.