DH and I have crossed this country by train several times...we do love train travel:) If we've camped near railroad tracks we must not have noticed the noise...OTOH, we live just below one of the approaches to an airport and we also have the AF fighter jets playing overhead at times. Again, all this was here before we were and we rarely notice the noise. If it's very quiet at night, it's cool to hear the late night trains coming through town, and they're at least a mile away! BTW, this time of year in the South you need AC, makes great white noise while cooling nicely:)