This HO scale (Set of 4) of AAR Type A roller bearing trucks is designed as a complete sideframe replacement for Proto2000 SW series switchers—specifically the SW900, but also compatible with the SW1200, SW8, SW600, and SW9.
Each set includes four sideframes, allowing you to fully upgrade both trucks on a single locomotive. Inspired by the real-world transition from friction bearings to roller bearings during locomotive rebuilds, these sideframes bring a more accurate, modernized appearance to your model.
Whether you’re restoring a detailed Proto2000 shell or customizing your switcher fleet, this upgrade offers reliable fitment and enhanced visual realism.
✅ Includes 4 Sideframes (enough for one full locomotive)
✅ Fits: Proto2000 SW900 / SW1200 / SW8 / SW600 / SW9
✅ Scale: HO
✅ Style: AAR Type A – Roller Bearing
Precision-printed in high-detail resin and test-fitted for proper alignment.
Made by a model railroader, for model railroaders.