@RJR posted:Imagine that the heavy current flowing for the train also has an effect on the voltage of the signal??????
Sorry, but I'm not buying. First off, for a siding, you would never be drawing more than a few amps. Also, I've can't imagine how the 60hz current in the wire is affecting the 3.27mhz signal, even at maximum current. I assure you it's certainly not a documented phenomenon, at least none that I've ever heard of.
I'll say it again. IMO, changing the wire from 18ga to 14ga for a siding didn't affect the DCS signal at all! Note that I'm not saying that you didn't experience a change in the DCS signal strength, what I am saying is it wasn't because of the wire size. Obviously, something else changed during this rewiring job.