<p>A MOSS-Image LoRA for photos of North American steam locomotives: famous preserved engines, classic wheel arrangements and the railroad scenes around them. Released as v0.5. It's good on the big-name mainline engines, liveries and scenes, but a few classes aren't right yet (see Known limits).</p><h3 id="what-it-does-well">What it does well</h3><ul><li><p>Famous engines by name: Union Pacific Big Boy 4014 and 844, Norfolk &amp; Western 611 and 1218, Southern Pacific 4449 Daylight, Canadian Pacific Royal Hudson, Santa Fe 3751, Chesapeake &amp; Ohio 614, Nickel Plate 765, Milwaukee Road 261, Reading 2102, PRR K4s, CN 6060</p></li><li><p>19th-century 4-4-0s: The General, the Golden Spike engines, generic American types</p></li><li><p>Wheel arrangements: 2-8-0, 2-8-2, 2-8-4, 4-6-0, 4-6-2, 4-6-4, 4-8-2, 4-8-4, switchers, narrow gauge (Rio Grande K-27/K-36, Durango &amp; Silverton)</p></li><li><p>Railroad scenes: smoke and steam, excursion trains, bridges, mountain grades, depots, museum halls, cab interiors, black-and-white archive photos</p></li><li><p>Works on both MOSS-Image Base and SFT. SFT gives sharper, better-composed results.</p></li></ul><h3 id="how-to-prompt">How to prompt</h3><ul><li><p>Start with the engine's name and type, then describe the scene, e.g. "Union Pacific Big Boy, a 4-8-8-4 articulated steam locomotive. Three-quarter front view of Big Boy 4014 leading a long freight train across a Wyoming plain..."</p></li><li><p>Short prompts work too ("Union Pacific Big Boy, a 4-8-8-4 articulated steam locomotive.").</p></li><li><p>LoRA strength 1.0.</p></li><li><p>Settings used for the samples: 40 steps, CFG 3, euler / sgm_uniform, shift 5, 1216×832.</p></li></ul><h3 id="known-limits-(why-this-is-v0.5)">Known limits (why this is v0.5)</h3><ul><li><p>Geared logging engines (Shay, Heisler, Climax) come out as ordinary rod engines, often with the name painted on the cab.</p></li><li><p>Southern Pacific cab-forwards come out with the cab at the back. Challengers often look like a single-unit 4-8-4.</p></li><li><p>Road numbers and lettering are often garbled. That's partly a limit of the base model.</p></li></ul><h3 id="training">Training</h3><ul><li><p>About 2,900 photos (mostly Wikimedia Commons) in 46 classes, each captioned three ways (long, medium and short MOSS-style captions).</p></li><li><p>kohya sd-scripts, rank 64 / alpha 16, about 13,500 steps in total.</p></li></ul><p></p>

North American Steam Locomotives | MOSS-Image LoRA

<p>First release (v0.5). Strong on famous mainline engines, liveries and railroad scenes. Geared logging engines, cab-forwards and road numbers aren't reliable yet; a later version will target those.</p><p>Recommended: MOSS-Image SFT (Base also works), LoRA strength 1.0, 40 steps, CFG 3, euler / sgm_uniform, shift 5.</p>

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