A comprehensive Build 42 rail system with multiple trains, detachable rolling stock, bidirectional routes, multiplayer track authority, claims integration, and RV-compatible passenger cars. Version 1.0.0 repairs consist rendering, coupler spacing, turn alignment, carrier scale, force-position synchronization, and first-notch braking, with an optional Faded Java Loader carrier-pinning bridge and a complete pure-Lua fallback.