Although the primary, eastern, connection between the Main Northern and Main Suburban lines is from North Strathfield and Strathfield, a secondary, western, connection exists between North Strathfield and Homebush. This connection is mainly used by freight trains but is occasionally used by passenger trains travelling to Olympic Park Station during trackwork or for major events at Olympic Park. As of 2014, the connection requires southbound trains to traverse a flat junction, blocking access for northbound trains. As part of the Northern Sydney Freight Corridor program a dive is being constructed adjacent to North Strathfield station to grade separate this junction. The work also includes construction of a fourth track from North Strathfield to Rhodes.