The old On30 Pacific Coast Air Line was based on the On30 railroad trackplan in the "2002 Model Railroad Planning" by Kalmbach Publishing. The major feature of the On30 track plan was the adaptation of the loads in/out. The spur was set up as a rock quarry to a rock crusher like the rock crusher in the November/December 1957 Model Railroader.
We have torn this layout down and are experimenting on other projects.
The layout was a Narrow Gauge Railroad based on the Turn of the Century California Narrow Gauge Empires like the Pacific Coast Railway, South Pacific Coast, North Pacific Coast, Paul Scoles's Pelican Bay Rwy. and Navigation Co. and Boone Morrison's North Coast Narrow Gauge Line. Hauling stone, sugar beets and the newly discovered black gold of the early California oil boom. An "Air Line" to relieve Central California of suffocation by the Southern Pacific Railroad.