Technical specifications

Scope of work

  • 2 parallel railway tunnels
  • length: 5.3 km each
  • internal diameter: 7.15 m
  • 7 cross-passages
  • 1 ventilation shaft

Construction method

  • TBM tunnelling using 2 EPB shields
  • shield diameter: 8.15 m
  • steel fibre reinforced segmental lining
  • both tunnels driven simultaneously from a retained cut structure


  • Sand
  • London Clay
  • Silt
  • Gravel

General data

Channel Tunnel Rail Link
Contract C250
single-track railway tunnel

Union Railways (North) Ltd.,
London, UK

Wayss & Freytag Ingenieurbau AG
in a joint venture

Construction period
February 2001 to September 2004

Construction costs
€ 217 m

Railway tunnel, single-track
2 * 5.3 km
Construction Method
TBM tunneling using a EPB shield
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