From the List of Railroads and Railroad Towns in Chester County website:
The Pennsylvania Railroad (Central Division) was built between 1853 and 1869 as the Philadelphia & Baltimore Central Railroad. It began at Wawa (Delaware County) with the construction of a spur from the West Chester & Philadelphia Railroad and crossed into Chester County at Chadds Ford. The route crosses Pennsbury Township (Chadds Ford, Mendenhall), then continues into Kennett Township (Rosedale), Kennett Square Borough, New Garden Township (Toughkenamon), Avondale Borough, London Grove Township (Baker Station), West Grove Borough, Penn Township (Kelton, Elkview), Lower Oxford Township (Lincoln) to Oxford Borough.
From Oxford Borough, the railway continues southwest into East Nottingham Township (Barnsley), West Nottingham Township (Sylmar) and south into Cecil County, Maryland.
Here are some of my pictures:
Tracks through Oxford, Pa.
"Oxford Yard"
East Penn RR switching Oxford Yard
The same train switching the Herr's Potato Chip plant in Nottingham, Pa.
East Penn RR through Lincoln University, Pa.