Tuesday, December 30, 2008

The Sound of Speed

The California High Speed Rail Blog has an interesting post with several videos on the noise impact that trains traveling at 220 mph will have when they pass through downtown areas in cities like Fresno and Bakersfield 50 times a day.
"A train running at 220mph will radiate roughly 1.65 times as much sound power as one traveling at 186mph. At a distance of 50m (~150ft), a TGV train will register a peak of around 92dB in open terrain. The new AGV may be expected to come in at around 94-95dB at that distance and its top speed, though improvements in train aerodynamics may have mitigated the increase."

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