Mani Vijay remembers his mother telling him how, as a child, he would move a measuring tape across the table, mimicking the movement of a train. The IT professional, who grew up in India and is now based in New Hampshire, says he has been passionate about trains for as long as he can remember. There is something about the Indian Railways (IR) in particular, he says—the romance, the chaos, the sounds, smells, and diversity, the nostalgia too—that has sustained his railfanning from childhood until well into his adult life….