The Keystone Railway Gem Mines are the source of all the gemstones on the Keystone Railway.
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The Keystone Railway Gem Mines have been running for several decades. Nearly every engine on the railway has worked in the mines at one point or another. The mines are always busy with engines running to and fro collecting gemstones from inside the mine shafts.
| Locomotives | Quartzes | Mystic Quartz | Blue Quantum Quartz | Mystic Topaz | Carnelian | Chalcedony | Amethyst | Citrine | Holly Blue Agate | Jasper | Onyx | Rainbow Quartz | Ruby Aura Quartz | Sardonyx | Smoky Quartz | Angel | Fire Agate | Pietersite | Mookaite | Bloodstone |
|---|---|---|
| Sapphires | Ocean | Winza | Blue Sapphire | Fuchsia Sapphire | Purple Sapphire | Rainbow Sapphire | Yellow Sapphire | |
| Diamonds | Blue Diamond | Green Diamond | Pink Diamond | Red Diamond | White Diamond | Yellow Diamond | |
| Pearls | Conch Pearl| Blue Pearl | Green Pearl | Pink Pearl | Red Pearl | White Pearl | Yellow Pearl | |
| Topazes | Blue Topaz | Imperial Topaz | Red Imperial Topaz | Poppy | |
| Beryls | Beryl | Euclase | Alexandrite | Emerald | |
| Corundums | Corundum | Ruby | Ruby Zoisite | |
| Other Gems | Iolite | Serpentine | Labradorite | Boulder Opal | Fuxite | Rainbow Moonstone | Meteorite | Goldstone | Tremolite | Dragon Breath Opal | Tsavorite | Fluorite | Lapis Lazuli | Malachite | Opal | Peridot | Rhodochrosite | Rhodonite | |
| Formerly | Ametrine | Star | Fluorite | Rhodonite | Padparadscha | Rutile | |
| Rolling Stock | Freight Cars | Ajoite | Ammolite | Angelite | Aqua Aura Quartz | Aurichalcite | Bertrandite | Bornite | Botallackite | Cadmoindite | Carpholite | Champagne Aura Quartz | Chrysocolla | Galaxite | Goodletite | Jeremejevite | Kornerupine | Laguna Agate | Lavender Quartz | Lavendulan | Neptunite | Peacock Topaz | Rainbow Fluorite | Rainbow Obsidian | Shattuckite | Stolzite | Tanzanite | Vauxite | Wendwilsonite | Zoisite |
| People | Currently | Rylie | Jacob's Parents | Sierra's Parents | Camdyn | James | Maddox | Mr. Thompson |
| Formerly | Jacob | Sierra | |
| Locations | Sheds/Houses |
Jacob's House | Rylie's House | Butler Engine Sheds | Keystone Railway Engine Sheds |
| Workplaces |
Gem Mines | Shunting Yard | Engine Works | |
| Other | Sodor-America Tunnel | Butler |