Built over the course of twenty-two months in 1882 and 1883, the Stone Arch Bridge across the Mississippi River in Minneapolis is a feat of engineering and a reminder of the importance of rail traffic in the late nineteenth century.

The Goodsell Observatory and its predecessor, a smaller observatory that opened in 1878, helped keep trains running on time and brought national prominence to Carleton College in Northfield, Minnesota, in the late nineteenth century and early twentieth centuries.