You enter the next tunnel you come to. It becomes smaller and smaller until you must crawl. You continue this way for almost an hour. Finally, your faith is justified, for you smell a fresh breeze blowing across a field of new-mown hay.
A moment later you are blinking your eyes in the bright sunlight, looking at a beautiful meadow nestled between gentle hills. A dozen or more cows are grazing near a meandering stream. In the distance is a dirt road. A farmer is sitting on a cart filled with hay. A dapple-gray horse is pulling the cart toward a big red barn in the distance. From the other direction you hear the mournful hooting of a train whistle.
You turn around and see that you are only a few hundred feet from the railroad tracks. A train is chugging around the bend, puffs of black smoke rising from its coal-fired steam engine. You are out of the Ice Age, all right, but not exactly in your own
time.

The train slows down as it approaches you, and you smile as you see the reason why-a cow is standing on the tracks just ahead, looking as if it would not move for anything. The train pulls to a stop, and a man jumps down from the cab, waving a coal shovel at the cow, which waits almost until the man is upon her before strolling back into the pasture. At that moment you realize you could easily climb onto the back of the train.