The Zig Zag tunnels occupy a 5km length of double track between Mount Victoria and Lithgow on the Main West Line from Sydney to Perth. The line is built on the cliff-like edge of the Blue Mountains. It winds its way round and through various rock outcrops resulting in many reverse curves and ten tunnels. Tunnel lengths vary from 880m to approximately 50m. For many years, the Public Transport Commission (PTC) of New South Wales has been experiencing great difficulty in maintaining the track to a satisfactory standard. The solution selected was paved concrete track, which is a track system developed by British Rail (BR) in association with McGregor (Paving) Ltd. It is designed to be virtually maintenance free and experience has shown it to be highly satisfactory in service. While paved concrete track was adopted, lowering the track by 650 mm to accommodate new double-deck cars led to complications which the article discusses.

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Duncan, S D
  • Publication Date: 1980-5

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Filing Info

  • Accession Number: 00324404
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Feb 18 1981 12:00AM