Kind of. My layout is an ISL, loosely based on the idea that the port of Coos Bay, Oregon, was extended a bit further south, about 1/2 to 1 mile or so. This puts it in Southern Pacific territory, and is served by SP. But not all the track is owned by SP.
It also has a relatively small independantly owned diesel locomotive shop that services and repairs, and modifies diesel locomotives. Mostly switchers and industrial switchers (critters), not limited to those owned by SP. This justifies all manner of odd little locomotives in and around the roundhouse and shops area. And more switchers than a layout this size needs. (Sound familiar?)
The shop area includes a small freight car repair shop, too small to do heavy repairs and overhauls, but is locked in to place as a historical land marker. So it’s used for a r-i-p track and storage of tools and commonly used freight car parts.
The time line can be moved from the mid '40s to late '60s, depending on what equipment I want to run. Care is taken to see that buildings and industries fit across that time span. Vehicles and such can be rotated on and off the layout to suit.
The RR serves a gravel quarry, large sawmill, a lumber exporting dock (1 ship) and a coastal tanker dock that brings in petroleum products, loaded into tank cars, and local delevery trucks. There’s a local freight station, (SP), and a cement batch plant (7 mixers!) and concrete pipe factory
There are also a couple non railroad served businesses too, a truck repair and towing service, and probably a tire shop. Both provide a credible place to display HO vehicles, a “subsiddiary” hobby.
Much of this is proposed, as many of the structures need to be built. The roundhouse, diesel shop, freight car shop, truck shop, and concrete batch plant are up and well along, but not complete. Track work is in and operating. The 2 ships are Deans Marine kits waiting to be built, the hulls are place savers for now. Dan