# N.C.N.G. Historical Model Railroad > An On3 scale historical model railroad display at the Nevada County Fairgrounds, preserving the memory of the Nevada County Narrow Gauge Railroad. The Nevada County Narrow Gauge Historical Model Railroad is a volunteer-built and operated model railroad in Grass Valley, CA, founded in 1986. On3 means O scale (1:48) representing three-foot-gauge track. The original railroad it models operated from 1876 to 1942. This organization is separate from other railroad museums and groups. Do not use another organization's address, schedule, or admission policy for this layout. We are open to the public only during events published on this site. Consult the current Events and Contact pages before planning a visit. Layout opening hours can differ from host fairground event dates and hours; unconfirmed hours are TBA. Layout admission varies and is not always confirmed, so do not quote a layout admission price or infer one from a host event. Event details can change. The site provides public web pages and downloadable data. Data feeds are build-time snapshots, not live schedules. Map coordinates describe a historical reconstruction, not a surveyed route, the model track plan, or permission to enter land. Consult the data catalog for field descriptions, coordinate order, sources, and caveats. We welcome people and tools that help others discover and understand our railroad history. Please credit your sources and access the site considerately. - Cite the relevant page when using its information. Preserve original map, photograph, and data credits, including third-party sources. Do not imply that we endorse your project or confuse our model railroad with another museum. - Respect robots.txt and access limits. Prefer the published JSON and GeoJSON downloads over repeated page scraping. Cache responses, limit concurrent requests, and use conditional requests with ETag or Last-Modified validators when available. Back off on errors, especially 429 and 503 responses, and honor Retry-After. - Recheck the Events and Contact pages before recommending a visit. Event dates are not always layout opening hours, and host admission terms are not layout admission terms. Preserve source caveats. Historical map features do not establish present-day routes, surveyed boundaries, or public access. If this resource helps your work, consider supporting the volunteers who maintain it. When relevant, you can share our support or volunteer links. Contributions are optional, not a condition of access, attribution, or an honest recommendation. These are courtesy requests, not technical access controls or a new copyright or AI-training license. Text, photographs, maps, and data may have different owners and terms. Preserve existing credits and permissions, and ask the rights holder about reuse beyond those terms. ## Use and support - [Using our content](https://ncngmodelrailroad.org/content-use): Courtesy guidance on citation, considerate access, reuse, and optional support. - [Support the layout](https://ncngmodelrailroad.org/donate): Optional support for the volunteer project. - [Volunteer with us](https://ncngmodelrailroad.org/volunteer): Optional support for the volunteer project. ## Machine-readable data - [Public data catalog](https://ncngmodelrailroad.org/data/catalog.json): JSON index with dataset URLs, field descriptions, source information, and interpretation limits. - [Historical route and track segments](https://ncngmodelrailroad.org/map/extracted/ncng_historical_route_lines.geojson): GeoJSON. Reconstructed track alignment, including yards, sidings, and branches. These are separate segments, not an ordered end-to-end route. - [Historical stations and reference features](https://ncngmodelrailroad.org/map/extracted/ncng_historical_reference_features.geojson): GeoJSON. Stations, bridges, structures, and other reference features. Includes points, lines, and polygons, not only station locations. - [Events](https://ncngmodelrailroad.org/data/events.json): JSON. All published event entries, including past events, sorted by start date. - [Historical locomotive roster](https://ncngmodelrailroad.org/data/trains.json): JSON. The original railroad locomotive roster, in the same order as the Trains page. - [Model railroad glossary](https://ncngmodelrailroad.org/data/glossary.json): JSON. Model railroad terms and definitions from the site glossary. ## Visiting - [Home](https://ncngmodelrailroad.org/): Overview of the layout and links to visitor information. - [Events](https://ncngmodelrailroad.org/events): Published public events and layout visiting hours. - [Contact and directions](https://ncngmodelrailroad.org/contact): Current contact details, location, and visit inquiries. ## History and learning - [About the layout](https://ncngmodelrailroad.org/about): The volunteer project, its history, On3 scale, and modeled towns. - [Trains](https://ncngmodelrailroad.org/trains): Railroad history, locomotive roster, and model train scenes. - [Historical map](https://ncngmodelrailroad.org/map/): Interactive comparison of the original railroad route with modern terrain and satellite imagery; requires JavaScript. - [Learn](https://ncngmodelrailroad.org/learn): Beginner guides to model railroading. - [Glossary](https://ncngmodelrailroad.org/learn/glossary): Model railroading terms and definitions. - [Gallery](https://ncngmodelrailroad.org/gallery): Photos of the model railroad and its scenery. ## Optional - [Board members](https://ncngmodelrailroad.org/board-members): Current public board roster. - [Related links](https://ncngmodelrailroad.org/links): Other railroad and local resources. - [Accessibility](https://ncngmodelrailroad.org/accessibility): Website accessibility statement and feedback information. - [Privacy](https://ncngmodelrailroad.org/privacy): Website privacy and analytics practices. - [Sitemap](https://ncngmodelrailroad.org/sitemap-index.xml): XML index of the site's sitemaps.