1. Product Overview
The BRIO 33973 Smart Tech Sound Action Tunnel Station is an interactive accessory for BRIO World wooden train sets. When used with a compatible Smart Tech Sound Record & Play Engine (sold separately), this station provides programmed actions such as slowing down, stopping, flashing lights, and playing station sounds. It enhances the play experience by adding realistic railway interactions and encouraging imaginative scenarios.
2. Safety Information
WARNING: CHOKING HAZARD -- Small parts. Not for children under 3 years.
Always supervise children during play. Regularly inspect all components for damage. Discontinue use if any part is broken or damaged. Keep packaging materials away from children.
3. Package Contents
The BRIO 33973 Smart Tech Sound Action Tunnel Station includes the following components:
- 1x Action Tunnel Train Station
- 1x Station Action Tunnel
- 1x Travel Wagon
- 1x Passenger Figure

Figure 3.1: All four components included in the BRIO 33973 Smart Tech Sound Action Tunnel Station set.
4. Setup
To set up your Smart Tech Sound Action Tunnel Station:
- Assemble the Station: Place the main station piece on a flat, stable surface.
- Attach the Action Tunnel: Securely place the transparent blue Station Action Tunnel onto the designated slot on the main station. Ensure it clicks into place.

Figure 4.1: Attaching the Station Action Tunnel to the main station.
This station requires a BRIO Smart Tech Sound Record & Play Engine (model 33971 or similar, sold separately) for full interactive functionality. The engine is battery-powered and interacts with the station to trigger sounds and actions.

Figure 4.2: The Smart Tech Sound Record & Play Engine, required for interactive play.
5. Operating Instructions
The Smart Tech Sound Action Tunnel Station is designed to interact with a Smart Tech Sound Record & Play Engine to create a dynamic play experience.
- Engine Interaction: When a Smart Tech Sound Record & Play Engine passes through the Station Action Tunnel, it triggers specific actions. The engine will automatically slow down, come to a complete stop, flash its lights, and play a station-specific sound.
- Passenger Boarding: Once the train has stopped, you can place the included passenger figure into the Travel Wagon.
- Continuing the Journey: After the interaction, the train can resume its journey on the BRIO World railway.

Figure 5.1: Smart Tech Sound train interacting with the Action Tunnel Station.

Figure 5.2: The station set up with a train and passenger figure.
App Integration
The Smart Tech Sound system can be further customized using the dedicated BRIO Smart Tech Sound app. This app allows you to change the sounds played by the engine when it interacts with the Action Tunnel Station, offering a variety of station announcements and ambient sounds from different cities like Berlin, New York, or Malmö.

Figure 5.3: Customizing engine sounds via the BRIO Smart Tech Sound app.
Product Overview Video
Video 5.1: A detailed overview of the BRIO Smart Tech Sound system and its interactive features.
6. Maintenance
To ensure the longevity and optimal performance of your BRIO Smart Tech Sound Action Tunnel Station:
- Cleaning: Wipe the station and accessories with a damp cloth. Do not immerse in water. Avoid harsh cleaning agents.
- Storage: Store the product in a dry place away from direct sunlight and extreme temperatures.
- Inspection: Periodically check for any loose parts or damage.
7. Troubleshooting
If you encounter issues with your Smart Tech Sound Action Tunnel Station, consider the following:
- No Sound/Action: Ensure you are using a BRIO Smart Tech Sound Record & Play Engine. Regular engines do not have interactive capabilities. Check the engine's batteries if it's not responding.
- Incorrect Sounds: If the engine is playing unexpected sounds, verify the settings in the BRIO Smart Tech Sound app.
- Physical Obstructions: Ensure no small objects are blocking the train's path through the tunnel or on the tracks.
8. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 12.6 x 6.3 x 7.87 inches |
| Item Weight | 15.4 ounces |
| Item Model Number | 33973 |
| Manufacturer Recommended Age | 36 months - 10 years |
| Release Date | September 15, 2020 |
| Manufacturer | BRIO |
9. Warranty and Support
For warranty information and customer support, please refer to the official BRIO website or contact your local retailer. Keep your proof of purchase for any warranty claims.





