 The line west of Terre Haute was built by the Terre Haute and Indianapolis Rail Road (in Indiana) and the St. Louis, Vandalia and Terre Haute Railroad (in Illinois), and was also completed in 1870.These companies became part of the Pennsylvania Railroad (PRR) through leases and mergers.Both lines became part of Penn Central Transportation and then Conrail, which decided to downgrade the PRR's line east of Terre Haute and the NYC's line west of Terre Haute, building a short connection in Terre Haute and forming the St. Louis Line.