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发帖数: 1318 | 1 Caltrain horns 1/4 mile before each street crossing (grade level). The
horn needs to be at least 96db at 100 feet. I measured the noise at
about 60 feet before, I believe it can reach 120db when it blows the
horn. Even when it does not, the noise can easily reach 90db.
At 1km away, I believe you can still hear the blowing train where there
is not much obstacle, when the surrounding is quiet --whether it
still qualifies as a noise depends on your tolerance.
In Sunnyvale, caltrain has grade level crossing only at Mathilda and
Sunnyvale. Fortunately this area is mostly occupied by business area and
apartments. Though there are some single family residences in this area,
it is not so much. The complains of caltrain noise in Sunnyvale are by
no means comparable to those from PA.
In PA, north of the railway is mostly single story residences, south has
more business. The pollution to the north is quite severe. For example,
in mid-town, you can hear the Caltrain roaring through in a quite sunday
afternoon any where south of middle field. -- I will say, it is not more
pleasant than the stink in milpitas. |
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