The Northern Sydney Freight Corridor (NSFC) was a project to improve access between Sydney and Newcastle for freight trains. Frequent passenger services operate on the Main Northern line between Strathfield and Broadmeadow. These passenger services take priority, meaning freight trains can be delayed and are subject to a curfew during peak hours. The Northern Sydney Freight Corridor aimed to reduce delays and increase capacity by providing additional train paths. The delivery of the NSFC projects was managed by Transport for NSW, with the exception of the Hexham freight loop which was delivered in June 2012 by the Australian Rail Track Corporation. The final stage was completed in June 2016.

The Main North Line is a major railway in New South Wales, Australia. It runs through Strathfield to Armidale. The line is the main line between Sydney and Armidale. As of 1988, the line closed progressively north of Armidale with services gradually withdrawn till 2004, with the main route between Sydney and Brisbane now the North Coast line.