The water line for the water tower is only like 3 feet underground. And the tower is not heated. Plus we do have to plan to maintain the engines. There are also some logistocal challenges with the consist used for winter, it's a lot easier to just run with diesel. 111 can barely haul the winter consist, 40 would stand no chance pulling it. Even with the changes this year is becomes even more complicated. The 50,000 plus people that rode last winter season didn't seem to mind.
Would be nice, but isn't very practical right now. Maybe in the future we can figure out a way to do it.