# colpi di pressione

## English translation: burst(s) of air pressure

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 13:52 Jun 6, 2000
Italian to English translations [PRO]
Tech/Engineering
 Italian term or phrase: colpi di pressione This is the phenomenon which occurs when two trains encounter each other in a tunnel and high velocity. The term is needed for a technical specification. The best I could come up with is burts of pressure. Any ideas. Jerry
 Jerry
 English translation:burst(s) of air pressure Explanation:To confirm your first choice: "The wide spacing between the lines is important because when two trains pass each other the speed difference can be as much as 600km/h or 370mph. If the two trains are too close together this causes at first a burst of air pressure when they first pass and then a drop in pressure during the coaches. Although this isn't enough to push the trains off the track, repeated stress on the windows may cause fatigue and mean they break eventually. So for safety reasons two tracks in each direction are placed further apart than on normal lines." See URL below.
Selected response from:

Skinner
 Excellent source reference, how did you find it? Thank you for your help! Pace e bene, Jerry4 KudoZ points were awarded for this answer

napressure waveMieke Leeuw
naburst(s) of air pressureSkinner

24 mins
burst(s) of air pressure

Explanation:
"The wide spacing between the lines is important because when two trains pass each other the speed difference can be as much as 600km/h or 370mph. If the two trains are too close together this causes at first a burst of air pressure when they first pass and then a drop in pressure during the coaches. Although this isn't enough
to push the trains off the track, repeated stress on the windows may cause fatigue and mean they break eventually. So for safety reasons two tracks in each direction are placed further apart than on normal lines." See URL below.

Reference: http://o-keating.com/hsr/hsls.htm
 SkinnerPRO pts in pair: 4
 Excellent source reference, how did you find it? Thank you for your help! Pace e bene, Jerry

9 hrs
pressure wave

Explanation:
found this in a technical dictionary, just another suggestion

 Mieke LeeuwLocal time: 17:27PRO pts in pair: 13

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