I recently visited the Hi-Line Railroad Bridge in Valley City, ND.

In operation since 1908, the bridge is 3,860 feet long and 162 feet above the Sheynne river. It was amazing to watch a train cross it as I stood watching from far below.

“Because the bridge was of vital importance in moving supplies and men,” the state tourism site reads, “it was closely guarded during both World Wars to prevent sabotage.” American Legion volunteers kept the bridge safe until the National Guard could be assembl...