- Added Train and TrainController classes in train.js
- Created TrainRenderer for Three.js visualization
- Integrated train controls into game.js
- Updated index.html with train UI controls
- Added train control styles to css/styles.css
- Created test file for train module
- Train can accelerate, brake, reverse and stop
- Keyboard controls: W/↑ accelerate, S/↓ brake, R/D reverse, SPACE stop