The Epping to Chatswood rail link (ECRL) (originally a part of the Parramatta Rail Link (PRL) proposal) is a railway line in the northern suburbs of Sydney, Australia, which connects Epping station on the Northern line with Chatswood on the North Shore line. It was formerly considered its own railway line, but is now considered part of the Metro North West Line. The 13 km line runs completely underground and includes three intermediate stations: Macquarie University, Macquarie Park and North Ryde. The junction stations at Epping and Chatswood both underwent major redevelopments to incorporate the new link. It was in service for less than a decade, opening in February 2009 and closing in September 2018. The vast majority of the infrastructure was incorporated into the Metro North West Line of the Sydney Metro network. The conversion took place as part of the Sydney Metro Northwest project. Earlier proposals There have been proposals for a railway between Sydney's North Shore and the Main Northern lines since September 1920, when John Bradfield's plans were put forward for a railway between St Leonards and Eastwood. The proposed route was via the present Parklands Avenue in Lane Cove to the head of Burns Bay, across the Lane Cove River near the present-day public school at North Ryde, and terminated about north of Eastwood station. After political moves, and potential engineering difficulties with hills south of Eastwood station in the 1930s, the terminus was changed to Epping, where the line became known as the "Epping-St Leonards Railway". To this end, the State Government resumed several of the estate houses in Epping around the present-day Brigg and Albuera Roads for a track to loop the line into the main line and terminate the trains at Epping. When voters in neighbouring Eastwood then complained, the line was proposed to link south of Eastwood, use island platforms at Eastwood and then link to Epping. In 1929, local real estate agents promoted land sales along the railway line at Epping in preparation for the construction of the line. They called the area "Epping Junction", on account of the station being a junction between the Epping-St Leonards Line and the Main Northern Line. A new island platform was also built in preparation for the terminus of the new line. The track was to be in the middle of the two Main Northern line platforms, and until the 1970s still existed