In the fall of 1833, the Camden Amboy railroad opened the first rapid transportation link between the nation’s two leading cities, New York and Philadelphia. Steamboats would take a passenger across New York Harbor, where they would board one of the nation’s first steam-powered trains to Bordentown; then a steamboat would finish the journey down the Delaware River to Philadelphia.

The nation marveled at reports when the trip was made in 6½ hours, considering by the previous method the journey took…