Introduction
This instruction manual provides essential information for the safe and proper use of your BRIO World 33481 Adventure Tunnel. Please read this manual thoroughly before assembly and operation, and retain it for future reference. This interactive accessory is designed to enhance play with BRIO World train sets.

Image: The BRIO World 33481 Adventure Tunnel, showing the gray rock-like structure with red brick arches and a yellow movable bridge, alongside its product packaging.
Product Overview
The BRIO World 33481 Adventure Tunnel is an interactive accessory for wooden train sets, featuring a rock-like design with two tunnel openings and a movable bridge. It is designed to integrate seamlessly with all BRIO railway toys.
- Interactive Play: The tunnel triggers 4 different real-world sounds as trains pass through, adding an auditory dimension to play.
- Skill Development: Designed to enhance fine motor skills and environmental understanding.
- Broad Compatibility: Fully compatible with all BRIO railway toys for expanded play scenarios.
- Durable Construction: Made from robust materials for lasting play.
- Sustainable Materials: Constructed with FSC-certified beech wood from well-managed forests and other controlled sources.

Image: A close-up view of the Adventure Tunnel, highlighting the yellow movable bridge element that connects the two rock formations.
Setup
- Unpacking: Carefully remove the Adventure Tunnel from its packaging. Ensure all components are present. The package contains one Adventure Tunnel unit.
- Battery Installation: The Adventure Tunnel requires 2 LR44 batteries (not included) for its sound features.
- Locate the battery compartment, typically on the underside or side of the tunnel.
- Using a small screwdriver, open the battery compartment cover.
- Insert 2 LR44 batteries, ensuring correct polarity (+/-).
- Replace the cover and secure it with the screw.
- Placement: Position the Adventure Tunnel on a flat, stable surface. It is designed to integrate with standard wooden train tracks. Align the track grooves within the tunnel with your existing BRIO railway layout.

Image: A single unit of the Adventure Tunnel, illustrating its complete form as one piece.
Operating Instructions
The Adventure Tunnel offers two ways to activate its sound effects:
- Automatic Activation: When a train passes through either opening of the tunnel, a sensor will detect its movement and trigger one of the four distinct sound effects.
- Manual Activation: A yellow button is located on the top of one of the rock formations. Pressing this button will manually activate a sound effect. Each press may trigger a different sound.

Image: A hand pressing the yellow button on the top of the Adventure Tunnel, indicating manual sound activation.

Image: A train entering the Adventure Tunnel, illustrating the automatic sound activation feature. A sound icon and battery requirement (2x AA, not included) are also shown.
Official Product Video
Video: An official product video from Ravensburger demonstrating the BRIO World 33481 Adventure Tunnel's features, including sound activation and train interaction.
Maintenance
- Cleaning: Wipe the tunnel with a damp cloth to remove dust and dirt. Do not immerse in water.
- Battery Replacement: If sound effects become faint or stop working, replace the LR44 batteries.
- Storage: Store the tunnel in a dry place away from direct sunlight when not in use.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound when train passes through or button is pressed. | Dead or incorrectly installed batteries. | Check battery polarity and replace with fresh LR44 batteries. |
| Sound is faint or distorted. | Low battery power. | Replace batteries. |
| Train does not trigger sound consistently. | Sensor obstruction or specific train dimensions. | Ensure the sensor area inside the tunnel is clear. Some non-BRIO trains may have slightly different dimensions affecting sensor activation. |
Specifications
- Model Number: 33481 (Internal: 63348100)
- Product Dimensions: 9.06 x 7.09 x 4.72 inches
- Item Weight: 14.1 ounces
- Recommended Age: 36 months - 10 years
- Batteries: 2 x LR44 (not included)
- Material: FSC-Certified Beech Wood and durable plastic components
- Compatibility: Compatible with all BRIO railway toys
Safety Information
BRIO products are designed with safety as a top priority. This product meets or exceeds all applicable safety standards. Please observe the following:
- Age Recommendation: Suitable for children aged 36 months to 10 years. Small parts may pose a choking hazard for younger children.
- Battery Safety: Always use the correct type and size of batteries. Do not mix old and new batteries, or different types of batteries. Remove batteries if the product is not used for an extended period. Dispose of used batteries responsibly.
- Supervision: Adult supervision is recommended during play.
Warranty and Support
For warranty information, product support, or to purchase replacement parts, please visit the official BRIO website or contact BRIO customer service. Keep your proof of purchase for warranty claims.
Website: www.brio.net
Manufacturer: BRIO





