By the late 1800’s the Pennsylvania Railroad had developed into a well-heeled transportation system but the rapid growth of industry would necessitate system wide improvements to bring the railroad into the 20th century. In 1902 PRR President Alexander J. Cassatt and Chief Engineer William H. Brown would embark on a series of projects to eliminate bottlenecks and operational problems across the system.
After the PRR acquired control of the Philadelphia and Columbia Railway through the purchase of the Mainline of Public Works in 1857, various segments were improved during the second half of the 19th century. The route between Philadelphia and Lancaster became an integral part of the PRR mainline connecting with the former Harrisburg & Lancaster creating the line we know today as Amtrak’s Keystone Corridor. The western end of the P&C would become a branch connecting the industrial and agricultural areas of Lancaster and Columbia. Due to the stiff grades both segments were less than ideal for heavy freight traffic. In addition to the P&C property accessing Columbia, the PRR had also gained controlled of the Harrisburg & Lancaster Railroad’s Columbia branch via Royalton and the Columbia & Port Deposit by the mid to late 1800's, further establishing Columbia as an important railroad hub. Though much of these water level alignments provided a network to move freight to Harrisburg, Cassatt sought to build a new route east from Columbia running across Lancaster County to create a modern freight bypass from New York and Philadelphia to the Harrisburg area and the mainline west.
The Low Grade as it was planned would run right through Columbia using the current alignment. From the east and west new construction would connect existing segments of the H&L and C&PD creating an improved mainline designed to move freight on a new grade separated line. This new route would divert most freight traffic off the mainline all together between Parkesburg and Harrisburg. Enola yard was completed in 1906 as part of the low grade project functioning as the western anchor for all freight trains and motive power between the Philadelphia and Middle Divisions. As a result Columbia importance as a major terminal would diminish due to its close proximity to the new facility, resulting in a significant loss of jobs in the area. Compounded by the diminishing local industry, a result of depleted ore and lumber resources, Columbia’s economy would begin a downward trend that continued through the Great Depression.
More change came on the PRR with the electrification of their network of rail lines in the Northeast. One of the last segments of the ambitious project was completed in 1938 affording the PRR the benefit of electric traction on the Low Grade, Columbia branch and Columbia & Port Deposit. During the electrification project, the PRR also consolidated many of the early towers with two modern CTC facilities controlling most of this freight network. Cola tower in Columbia controlled all trains on the Columbia Branch to Lancaster, roughly forty miles of the Columbia & Port Deposit Branch including the junction with the A&S Branch at Port and the York Haven Line west to Shocks Mill. Cola’s jurisdiction over the C&PD was unique in that most of the line was actually under control of the Baltimore Dispatcher and was considered part of the Chesapeake Division, while Cola was part of the Philadelphia Division.
The Low Grade and electrification would survive the Penn Central debacle but ultimately met its demise after the creation of Conrail. Due to the high cost of electric supply charges, the aging infrastructure and the dependency on Amtrak to move trains east of Parkesburg it was decided to abandon an integral part of the system in favor of the neighboring Reading Railroad mainline ending over 80 years of service on perhaps one of Cassatt and Brown’s greatest achievements. The Columbia and Port Deposit survives as Norfolk Southern’s artery to Maryland’s Eastern Shore and the Port of Baltimore. The former P&C to Lancaster provides NS a dedicated connection to Dillerville yard servicing the industrial areas around the seat of Lancaster County. Though not what used to be Columbia still sees a parade of freight daily, though mostly nocturnal, moving freight as Cassatt had envisioned over a century ago.