 This stretch was originally built from 1918-1922 on the old route of the Delaware, Lackawanna and Western Railroad, and is called the "Lackawanna Trail".Prior to 1941, US 11 followed Walnut Bottom Road between Shippensburg and Carlisle while PA 33 ran along the Governor Rittner Highway.In 1941, US 11 and PA 33 swapped alignments, with US 11 moving to Governor Rittner Highway and PA 33 moving to Walnut Bottom Road.