I was traveling through the Tehachapi Mountains, (in CA but not for a good reason) and I got to thinking, has anyone ever explored if it would be fiesable to build a second track elevated on top of the first track? With the mountains, there probably would be solid rock to anchor onto and the grade wouldn't really be any steeper than the track that's already there. I don't know if anyone has ever considered if it's possible or cost effective for double tracking in areas were it might be otherwise very difficult.
-Greg Primrose
Co-Owner, Railroad.Net
Ave Atque Vale
Co-Owner, Railroad.Net
Ave Atque Vale