The Pakenham line is a commuter railway line on the Melbourne metropolitan railway network serving the city of Melbourne in Victoria, Australia. Operated by Metro Trains Melbourne, the line is coloured light blue and is one of the three lines that constitute the Metro Tunnel Group. It is the city's longest metropolitan railway line at 58.8 kilometres (36.5 mi). The line runs from Town Hall station in central Melbourne to East Pakenham station in the south-east, serving 24 stations via Caulfield, Oakleigh, and Dandenong.