The North Union Railway was an early British railway company, operating two main routes, from Parkside to Preston and from Bolton Trinity Street to Preston, all in Lancashire. The northerly part of the routes sharing the line from Euxton to Preston.

Parkside railway station was an original station on the Liverpool and Manchester Railway. It then became the interchange station between lines when the Wigan Branch Railway opened in 1832, moving to the physical junction of the two lines in 1838. The station continued as an interchange until being by-passed in 1847 when a west curve was opened to facilitate north–south links that did not go through the station. Traffic declined further after the Winwick cut-off opened in 1864 leading to closure in 1878.