The golden age of the railroad ended in the mid-20th century, when Americans switched from Pullman cars to Chevys and eventually 747 jetliners. Yet, to John R. Stilgoe, Robert and Lois Orchard Professor in the Faculty of Arts and Sciences and Harvard Graduate School of Design, trains are anything but passé. Based on analyses of real estate investment patterns along railroad corridors, Stilgoe predicts that trains will once again play a key role in shaping American life.