Letters

Tunnel travelling

BMJ 1994; 309 doi: https://doi.org/10.1136/bmj.309.6958.881a (Published 01 October 1994) Cite this as: BMJ 1994;309:881
  1. K Laitinen
  1. Leiras Oy, PO Box 325, FIN-00101 Helsinki, Finland.

    EDITOR, - In his interesting editorial on the health risks associated with travelling through a tunnel David W Proops states, “Rapid changes in ambient pressure occur when entering a tunnel at speed, or when two trains pass each other in a tunnel. This increase in pressure deflects the …

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