Increased update intervals from 50ms (20fps) to 16ms (60fps) for smoother train movement without using react-spring animations. Changes applied to: - Game logic loop (useSteamJourney.ts) - Momentum/position updates (Provider.tsx) - Position broadcasts for multiplayer (Provider.tsx) This resolves the regression where react-spring animations caused guest players' trains to freeze at their starting position in multiplayer games. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>