The Pittsburg, Shawmut & Northern Railroad (reporting mark PSN) also known as the Shawmut Line, was a Class I railroad company operating passenger and freight service on standard gauge track in central Pennsylvania and western New York. The line was financially troubled for its entire life span and declared bankruptcy after just six years of operation. It would spend the remaining 42 year of its existence in receivership or trusteeship, one of the longest bankruptcy proceedings in American railroading history.