LeTrain is a procedural train simulator that fuses a retro ASCII/terminal aesthetic with a modern 3D engine, letting players design vast rail networks, manage a logistics-driven economy, and explore an effectively infinite world. Gameplay centers on building and optimizing transport routes for specialized cargo (GOLD, COAL, RUBY) with a capital-management system that starts players at $0 and scales revenue by travel distance. Worlds are generated with custom Perlin noise and randomized seeds (±10k-100k units) so scenarios are portable as plain-text .LTR recipes; the same seed rebuilds the same world. The editor workflow is robust: record/edit mode, undo/redo for construction and state, an integrated scenario/programming/config editor, experiment snapshots, and a headless LETRAIN-CHECK validator. The project ships both a high-performance 3D LibGDX client and a classic high-speed ASCII terminal client, with configurable gameplay via letrain.cfg.
The codebase is Java 17, uses LibGDX for 3D, Lanterna for terminal UI, a custom ANTLR4 scripting language for rail automation, and a granular synthesis audio engine. Builds are automated with Maven producing three distributions (3D, 2D, headless checker). Development traces back to 2006 under Antonio Vázquez Araujo; since March 2026 an OpenCode team of AI agents implements changes under his direction, with human review and public CI. The project is Apache-2.0, documented for contributors, and notes Snap sandboxing limitations on WSL2 and remote desktop with recommended build/workaround instructions.
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Anthropic is a public benefit corporation committed to developing safe and trustworthy AI that benefits humanity in the long term. Its principles focus on AI safety, regulation, democracy, prosperity, and equitable distribution of AI benefits. (anthropic.com)
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