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Division 7.3.3 Maximum pressure variations in tunnels (Section 4.1.13)

United Kingdom

Original text. Later amendments are not shown.

To take account of the numerous tunnels with a cross-section of 54 m2 which are traversed at 250 km/h, and those with a cross-section of 82,5 m2 and traversed at 300 km/h, Interoperable trainsets operating on the Italian network shall conform to the following envelope curve:

  • ΔP0 < or = 1 600 Pa,

  • ΔP1 < or = 3 000 Pa,

  • ΔP1 - 0,8ΔP0 < or = ΔP2.

These values are given by:

  • a ratio between the train and tunnel cross-sections of 0,18,

  • a service speed of 250 km/h,

If a trainset does not fulfil the values specified above, the operation rules for this train shall be determined by applying the published rules of the infrastructure manager.