Duffy's Cut is the name given to a stretch of railroad tracks about 30 miles west of Philadelphia, United States, originally built for the Philadelphia and Columbia Railroad in the summer and fall of 1832. The line later became part of the Pennsylvania Railroad's Main Line. Railroad contractor Philip Duffy hired 57 Irish immigrants to lay this line through the area's densely wooded hills and ravines. The workers came to Philadelphia from the Ulster Counties of Donegal, Tyrone and Derry to work in Pennsylvania's nascent railroad industry. Less than two months after their arrival, all 57 are believed to have died during the second cholera pandemic. While most died of the disease, forensic evidence suggests that some may have been murdered, perhaps due to fear of contagion. which was a worldwide contagion spanning several continents and many years.