The Craigieburn line is a commuter railway line in the city of Melbourne, Victoria, Australia. Operated by Metro Trains Melbourne, it is the city's sixth shortest metropolitan railway line at . The line runs from Flinders Street station in central Melbourne to Craigieburn station in the north, serving 21 stations via North Melbourne, Essendon, and Broadmeadows. The line operates for approximately 19 hours a day (from approximately 5:00 am to around 12:00 am) with 24 hour service available on Friday and Saturday nights. During peak hour, headways of up to 5 minutes are operated with services every 20–30 minutes during off-peak hours. Trains on the Craigieburn line run with a two three-car formations of Comeng or Siemens Nexas trainsets.
Services on the line began from North Melbourne to Essendon by the Melbourne & Essendon Railway Company in November 1860. It was closed shortly after, however, the Victorian Railways reopened the Flemington Racecourse line (including the Essendon line as far as Newmarket) in November 1867, and in January 1871, to Essendon. The line was progressively electrified and, in 1921, the line was electrified to Broadmeadows, where it remained till the extension of electrification in 2007.
Since the 2000s, due to the heavily utilised infrastructure of the Craigieburn line, improvements and upgrades have been made. Works have included replacing sleepers, upgrading signalling technology, the extension of the line to Craigieburn, the construction of new stations, the removal of level crossings, the introduction of new rolling stock, and station accessibility upgrades.
The line from North Melbourne to Essendon was opened by the Melbourne & Essendon Railway Company in November 1860. Soon after, the company opened a branch from Newmarket to Flemington Racecourse. Both lines were closed shortly after, in July 1864. The Victorian Railways reopened the Flemington Racecourse line (including the Essendon line as far as Newmarket) in November 1867, and in January 1871, to Essendon.