The Atglen and Susquehanna Branch is an abandoned branch line of the Pennsylvania Railroad that ran between Lemoyne and Atglen, Pennsylvania. A portion of the line is now the Enola Low Grade Trail.

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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. With freight service on the Main Line hampered by relatively steep grades, the A&S Branch—which was specifically designed with minimal grades and curves—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 by July 1906.^[1]

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.^[2]

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 (1968–1976) and into the era of the PC's successor, Conrail. Conrail downgraded the line, removing the overhead catenary and later rerouting traffic over the former Reading Company's line between Harrisburg and northern New Jersey. The last train ran on the line in 1988. Conrail petitioned the Interstate Commerce Commission to abandon the line in 1989 and track was removed around 1990.

While the track had been removed prior to the 1999 breakup of Conrail by the Norfolk Southern (NS) and CSX, the right-of-way was retained due to disputes over the historical nature of the line's bridges and passed to NS. A group called Friends of the Atglen–Susquehanna Trail proposed using the line as a rail trail, which was opposed by local residents and ultimately failed. In July 2008, NS sold a portion of the abandoned line to eight municipalities,^[3] charging each $1 and supplying a total of $1.4 million in grants for bridge removal or repair.^{[citation needed]} NS also contributed $1.25 million to Manor Township to develop their portion of the right of way.^[4] After being abandoned, much of the right of way had been overgrown with heavy brush, and while the rail and ties had been removed, a rough surface of loose track ballast remained.