Unless you grew up or live beside a noisy train track, to some people, a train whistle is the loneliest sound in the world. Someone even wrote a song about it. On a loosely related musical note, “One is the loneliest number” according to the lyrics of Three Dog Night, but let’s not concern ourselves with that. We think train whistles signify adventure, speed, and excitement – possibly sleep, even. Station to station; check out these possible train trips across…