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- Eleven collectible types — switch keys, padlocks, lanterns, lantern globes, signs, signals, photographs, documents, maps, china, builder's plates, bells.
- Articles — long-form research and identification guides, contributed by collectors.
- Collector profiles — every contributor has a profile linking to their submissions.
- Memorial collections — collections of deceased collectors are attributed permanently in their memory.
- Browse by railroad, manufacturer, era — every item is cross-indexed.
- Conditions tracking — original, altered, restored, broken/damaged, re-marked, re-shanked, fantasy, Sullivan.
- Reproductions archive — known fakes are catalogued and clearly marked.
- AI search optimization — articles and the glossary are structured so AI engines (ChatGPT, Claude, Perplexity, Google AI Overviews) can quote them accurately.
- Sponsorship system — three-tier partner program supports the archive financially without ads.
- Newsletter signup — periodic updates on new additions and project news.