The Milwaukee and Mississippi Railroad was opened to Janesville; a later history states the eight-mile Janesville branch was built in 1853.

The evidence

• “The Milwaukee and Mississippi Railroad passes through the town of Lima to Milton village; here it branches, tho north branch passing through Milton and Fulton, in this county, thence to Madison and the Mississippi at Prairie du Chien; the south branch through Milton and Harmony to Janesville, to which place it was opened in January, 1852. From Janesville this road will éxtend west through Janesville, Rock, and Spring Valley, thence through Green, Lafayette and Grant counties, to the Mississippi, at Dubuque.”

  1856-history-of-rock-county/03-rock-county.md, PDF p. 43 / book p. 25

  Guernsey, Orrin, and Josiah F. Willard, editors. History of Rock County, and Transactions of the Rock County Agricultural Society and Mechanics' Institute. Janesville, Wis.: William M. Doty & Brother, 1856. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871593.

  Grade A: Found on a page of one of our sources