Atglen and Susquehanna Branch

The Atglen and Susquehanna Branch is an abandoned branch line of the Pennsylvania Railroad. The line ran from Lemoyne to Atglen, Pennsylvania.

The Atglen and Susquehanna (A&S) Branch was built by the Pennsylvania Railroad (PRR) between 1902 and 1906. The branch was built to relieve congestion on the Philadelphia to Harrisburg Main Line and the railroad's Columbia & Port Deposit (C&PD) line. It was designed for freight service, and minimizing the grade profile was of high importance, since freight service on the main line was hampered by relatively steep grade profiles. Thus the branch was often known simply as the "Low Grade."

During construction of the A&S Branch, the existing C&PD stone bridge at the Conestoga River washed out. Rather than rebuild, the C&PD bridge was combined with the A&S bridge to form a unique two-line, two-level steel viaduct known as the Safe Harbor Trestle. This bridge at the Conestoga carried the C&PD line over the river, while the A&S ran parallel and approximately 100 feet (30 m) above.

Construction was completed and the line opened for traffic by July 1906.

When combined with the railroad's Trenton Cutoff and Philadelphia & Thorndale Branch, the new line permitted the PRR to operate a low-grade bypass between Morrisville, Pennsylvania (just south of Trenton, New Jersey) and Harrisburg. This allowed freight trains to avoid the congestion of the eastern seaboard and the steep grades of the Main Line.

The line flourished with freight traffic until the decline of northeast railroads and overall reduction in traffic made the line redundant. The line survived PRR's short-lived successor Penn Central (1968-76) until the era of Conrail (1976-89). Conrail downgraded the line, first removing the overhead catenary, then by rerouting traffic over the former Reading Company's line from Harrisburg to northern New Jersey. The last train on the line ran in 1988. Conrail petitioned the Interstate Commerce Commission to abandon the line in 1989 and track was removed around 1990.

...
Wikipedia