Three is this thing called slab track, and that's essentially what you are talking about, just without any stones. https://grn.ams3.digitaloceanspaces.com/wp-c

Three is this thing called slab track, and that's essentially what you are talking about, just without any stones. https://grn.ams3.digitaloceanspaces.com/wp-content/uploads/DSC00856-1024x768.jpg https://grn.ams3.digitaloceanspaces.com/wp-content/uploads/D... Truly almost all new lines should be built this way, its simply a far, far better method. Slightly higher capital cost but far less maintenance.