Both the 1916 valuation map and the track and siding map materials that were compiled by SVRy chief engineer Earl Emlaw much later for the Oregon tax commission in which he cites the AFE mentioned above say 3 rail. Sanborn was primarily interested in showing the relation of buildings to one another, to fire resources, construction types and any other facet that might relate to fire insurance rates/ exposures. We may be lucky that so many small details are represented on their maps and if a detail unrelated to fire insurance such as NG or 3 rail is in error I can't feel too surprised. I don't have the materials here at home, so can't review the track valuation material again tonight. I will double check myself tomorrow. I do wonder why Stoddard would have needed a 3 rail spur. Perhaps it was to receive outside parts shipped on std. ga. cars such as car wheels sets, and castings comming from suppliers afar to build cars.