I recently traveled across the United States by train. It takes four days for a train to travel 3,000 miles — that’s the distance between the east and west coasts. When I began the trip this March, it was snowing in New York and some parts of the Hudson river still had ice. The trees were bare and the sky was grey. Our train followed the Hudson river northward, and then passed by small towns with lots of brick buildings. We had to wait at one of the stations in upstate New York for a connecting train to bring sleeper cars that would be attached to our train — the sleeper cars I would be staying in. We passed by one of the Great Lakes. Sometimes it snowed, but it didn’t stick to the ground. Our train pulled into Chicago late because of the delay, so we missed the connecting train and stayed the night in Chicago. No matter; you shouldn’t take the train cross country if you are in a hurry. Downtown Chicago is windy, just like everyone says, but it …