|View single post by elminero67|
|Posted: Sun Dec 27th, 2009 03:43 pm||
|Just stumbled on your post on one of my favorite topics, retaining walls and thought I'd share a few pics from years of stumbling along ROWs: A couple of things I noticed that nearly all narrow gauge retaining walls in the Southwest were made of native rock gathered very near the wall-the Silver City line tried to use quarried limestone from a quarry they owned, but then again they went out of business shortly afterwords....Here is a mortarless retaining wall on the Little Fanny tramway in Mogollon:
If memory serves me the rock at Mogollon is a volcanic rhyolite or something like that, but the point is it does not stack well, and does not have a flat "faces" that make it easier to work with as a mason, or to model
The rocks on Helvetia narrow gauge near Tucson
stack better and have more variety of color.
Above: Another mortarless wall at the Little Fanny Tramway as it passes through the compant town, its been a while but I believe this was a morphisized dolomite mix.
Some of the best work I've seen is on the Coronado Railways twin in Mexico, the Moctezuma Copper Co: Notice the bright colors of the copper sulphides that are common in mining areas
Concrete generally became available as soon as the town was connected to the outside world with a railroad, but it was expensive and generally used for stamp mill foundations and other essential uses until the 1920s and 1930s. Here is another retaining wall on the Moctezuma narrow gauge built circa 1930. in the ghost town of Pilares de Nacozari, the Moctezuma Copper narrow gauge ran on top of the retaining wall:
Last edited on Sun Dec 27th, 2009 06:53 pm by elminero67