The North Shore & Western Line (numbered T1, coloured orange) is a commuter rail service operated by Sydney Trains, serving the North Shore, parts of the Inner West and Western Suburbs of Sydney.

As a result, the traditional Northern line route from Hornsby to Central via Strathfield was reinstated.

The North Shore railway line was opened on 1 January 1890 between Hornsby and St Leonards.

Transport between this original Milsons Point station and central Sydney was by ferry boat.

The result is that the two ends of the North Shore Line link to the Sydney railway system at Central and Hornsby.

Services then run along the Main Suburban Railway, usually using the middle 'Suburban' pair of the six tracks between Redfern and Strathfield.

Services continue west from Strathfield to Granville where trains join the Main Western Line.