I think the train would clearly register and it would not really be pointless. If the coal train passes every 3 to 4 hours and takes a few minutes to pass you’d register a total of perhaps 30 minutes, the rest would be cleaner. Best place to put this device in a basement though
Thanks - that has re-piqued my interest then. I'm on a rural property, no basement, but lots of undisturbed land with few people around. Bountiful night time and crepuscular animals however, that may interrupt the relative (and presumably very delicate) tranquillity of such devices.
Reading TFA it sounds like readings are often rejected by authoritative sources, but are still locally extremely useful.
