The line was later extended from Polk Junction, West of Franklin, to Rose, just west of Brookville, PA. Also added was a connector South from Franklin to the Allegheny River crossing on the new extension. This line included perhaps the most impressive engineering structures on the LS&MS (as well as the later NYC) with several large trestles, bridges and tunnels near Brookville, including a bridge-tunnel-bridge-tunnel-fill combination near Piney, and two magnificent trestles West of Brookville near Corsica. The New York Central used trackage rights over the Pennsylvania Railroad and B&O to connect from Rose to NYC lines at Clearfield, PA.