I noticed this off-chance as I was saving a few bucks on a house-call installation onboard my RV by driving over to their shop. A train happened to go thru at the time and I quickly keyed in the local rail frequency to hear his mile marker report while still sitting in my driveway. Loud and clear with full quieting, as usual. A little while later (and only about 3.5mi from the QTH, on the North side of a cell tower that has never caused interference before) another train came thru and he lit up on the same local freq but very noisy, choppy and static, and very faintly in the background I could hear a woman's voice. She was on a phone call. laughing and talking in a normal voice but too noisy for me to understand a single word. There was the usual up and down lilting inflection and tone that you would hear from a woman talking to a friend. Later that afternoon another train, and back to the usual good signal and tone of my SDS200 on the rail frequency, this time on the South side of the tower and parked back in my driveway. Not until today did I redo the test and I got the same exact results. I swear I am hearing a cell phone call! Unintelligible and faint, but very definitely a phone call. This is happening only on the Dayton District rail frequency 160.980. Any idears?