Campgrounds and trains seem to attract to each other don't they? But I will say if you have tracks that are still in use, the whistle will be loud and trains don't care what time of the day it is. Look at google earth and see where the tracks are located. My bet is that it may be a local frieght train working business's along the way. Night or day don't matter, required to blow whistle at every crossing with 2 long tones, one short and another long. So if there is hwy. crossings they are required to do this.
Have to add that if it is a main line this could explain the frequent whistle. If thats the case I would be wary!
Hope this helps you out.
Dave
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