I'm interested in using a local rarely use railroad as a flight path when no trains are present for my P3. It seems to me that it is a no brainer concerning safety issues like not flying over people, houses, private property (other than rr private property) parks etc. This would also give me a very visible landmark to use when returning the drone home, and be a good route to test distance flights. Im aware of comments on this forum suggesting that the radio frequencies used by the railroads might interfere with drone signals, but my question is would there be any other interference when a train is not present that would interfere with my P3 signal? Would the rails or other railroad electronics be any kind of issue?