RAILROADS IN THE UNITED STATES - Pennsylvania State University

1852 For the first time, Pittsburgh, PA is linked to Philadelphia, PA via rail (using the inclined plane from Johnstown, PA to Hollidaysburg, PA) and via the Pennsylvania Railroad. Now rail development to the West can proceed apace. 1854 The Pennsylvania Railroad’s 1300-foot long Horseshoe Curve at Altoona, PA is opened for service. ................
................