Tunnel travellingBMJ 1994; 309 doi: https://doi.org/10.1136/bmj.309.6958.881a (Published 01 October 1994) Cite this as: BMJ 1994;309:881
- K Laitinen
- 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 …