Oval shaped object like a domino with rounded cormers with rows of white lights, moving at high speed.I saw one object, moving East to West. It had to be moving very fast because it was only visible for 10 to 12 seconds. I am a locomotive engineer by profession, I was sitting in a Union Pacific Railroad siding called Hestes, located btween Hutto and Taylor, Texas. I had pulled in behind another train and was waiting for an opposing train. I walked out the back door of the engine and was standing on the walkway. Hestes is rather remote and is a good place for star gazing, that's what I was doing when the object caught my eye. The lights on the object gave it an oblong appearance, sort of like a domino with the corners rounded off. Some of the lights on the object appeared slightly oblong also. The lights were white, but not a brilliant white, they did not appear to shine downward and there were no blinking lights visible. The object appeared about 1:15 AM. It was a clear night.