The NPC actually built one locomotive and did a major conversion on another. In addition Carter Brothers would have needed machine shop facilities to construct the cars it produced in Sausalito for the NPC. This machine shop will be built to display a variety of industrial metal working tools driven by a dedicated boiler, a steam engine, and appropriate drive belts.
Fortunately Sierra West produces a kit that includes the equipment …
as well as a vertical boiler, a steam engine, and related components and clutter. Note that these images are used by permission from Brett Gallant.
The facility in which this equipment is placed will be open on one side and modeled after the NPC structures for which I have photos.