The North Strathfield Rail Under Pass project is designed to grade separate 1.5km long diesel hauled freight trains from the electrified suburban rail network north of Sydney. The freight line will pass under three heavily trafficked suburban railway lines and one line currently not in use. The client and their consultants original concept was for a cut and cover tunnel that would take between three and five years to constructed because of the limited number of track possessions available during any one year. This paper describes other options considered before adopting an alternative 170m long highly skewed and very shallow driven tunnel under the operating railway tracks which will reduce the construction time to less than 12 months by minimising the need for track possessions.
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