The Bachmann 255 O Scale Williams True Blast Plus Sound Unit for Alco FA diesel locomotives adds realistic operating sounds to compatible Williams by Bachmann O scale 3-rail Alco FA diesel models. The True Blast Plus system delivers Alco FA prime mover, dynamic brakes, horn, bell, and cab sounds - all triggered automatically by locomotive motion and speed. The drop-in design fits directly into compatible Williams locomotive bodies without modification. An excellent upgrade for bringing silent Williams O scale locomotives to life with prototype-accurate sound.

Key Features:
- True Blast Plus sound unit for Williams Alco FA diesel O scale locomotives
- Automatic sounds triggered by locomotive motion and speed
- Includes Alco FA prime mover, dynamic brakes, horn, bell, and cab sounds
- Drop-in installation - no body modification required
- Compatible with Williams by Bachmann O scale 3-rail locomotives
- Scaled for O scale (1:45) layouts
- Based on real-world prototype equipment for maximum authenticity
- Manufactured by Bachmann - a world-leading model railroad brand
- Adds authentic detail and realism to any model railroad layout scene
- Pairs beautifully with other scenic accessories for a complete, cohesive scene
- Great for beginner and experienced modelers alike
- Easy to position and secure with standard scenic adhesives