How many pieces are in the Train Tunnel and Tracks Expansion Set?

Train Tunnel and Tracks Expansion Set contains 20 pieces.

What age is the Train Tunnel and Tracks Expansion Set recommended for?

This set is recommended for ages 2+.

When was the Train Tunnel and Tracks Expansion Set released?

Train Tunnel and Tracks Expansion Set was released in 2025.

LEGO Train Tunnel and Tracks Expansion Set set 10425

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🏛 Trains

Set #10425

Train Tunnel and Tracks Expansion Set

Name: Train Tunnel and Tracks Expansion Set
Brand: LEGO
SKU: 10425-1

The Train Tunnel and Tracks Expansion Set is a must-have for Duplo train enthusiasts.

🏆 Best For: Perfect for toddlers and young children who enjoy Duplo trains. ⏱ 0.5 hr build 🧩 20 pcs 🎂 Ages 2+

★★★★☆ 4.2

Users appreciate the Train Tunnel and Tracks Expansion Set for its ability to enhance Duplo train layouts and add interactive play. Some find the price slightly high for the number of pieces, but overall, it's considered a worthwhile addition for Duplo train enthusiasts.

MSRP

$19.99

Check price on Amazon

📝 Our Take

The Train Tunnel and Tracks Expansion Set is a must-have for Duplo train enthusiasts. This set expands the play possibilities of any Duplo train setup with a tunnel, tracks, and action plate, offering a variety of new ways to interact with your train sets.

This set is perfect for young children who love trains and building. The large Duplo bricks are easy for small hands to manipulate, and the simple construction makes it a great introduction to building and expanding train layouts.

Skip this if you're looking for a complex building experience or are outside the Duplo age range. This set is specifically designed for toddlers and young children; older builders should explore Creator or Technic train sets.

✨ New

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How does this expansion set enhance the play experience with existing Duplo train sets? What are some creative ways to incorporate the tunnel and tracks into different Duplo builds? Is this set a good value for the price compared to other Duplo train sets? How durable are the tracks and tunnel for repeated use by young children?

🧱 Building Experience

🧩

Pieces

⏱

0.5h

Build Time

📊

Beginner

Difficulty

📏

20cm × 16cm × 15cm

Dimensions

Build Highlights:

Easy to assemble for small hands
Includes a tunnel element for added play value
Features a train action plate for interactive play
Adds variety to existing Duplo train layouts

📈 Investment Analysis

↓ Price declining

C+

Investment Grade

⏳ Active

The Train Tunnel and Tracks Expansion Set, while not a traditional investment piece, holds some potential for maintaining its value, especially if kept in good condition. As a Duplo set, it caters to a younger audience, ensuring consistent demand. Its low price point makes it accessible, but also limits potential appreciation. The set's value is tied to the continued popularity of Duplo trains and the availability of compatible sets. Given the relatively low piece count and mass-market appeal, significant appreciation is unlikely, but it should hold its value reasonably well.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

📖 About This Set

Extend toddlers’ train adventures with the Train Tunnel and Tracks Expansion Set (10425) toy for toddlers. Preschool kids aged 2+ grow their learning adventures as they add a tunnel and extra track to their LEGO® DUPLO® Town interactive toy train sets (10427 and 10428, sold separately).

This creative building toy comes with a tunnel build and a 10-piece track, including a funnel element and a 2-way points switch so toddlers can change their train’s direction of travel. The action brick lights up the dark tunnel when activated by the interactive train from sets 10427 and 10428.

This kids’ learning toy encourages a toddler’s development. By extending the train track through the toy tunnel, preschoolers learn spatial awareness. Using problem-solving skills to combine the toy track and prediction skills to determine the train’s destination, toddlers develop patience and focus as they discover the many routes they can make.

Train track toy set – Toddlers aged 2+ extend their LEGO® DUPLO® railway adventures and learn development skills with the Train Tunnel and Tracks Expansion Set
Comes with lots of extra pieces to grow the fun – This creative building toy includes 10 track pieces, 1 action brick, a 2-way points piece and tunnel and funnel elements
Anytime gift idea – This extension set makes a fun treat for any toddler who loves to play with their LEGO® DUPLO® interactive toy train sets, sold separately
Quality toddler toys – All elements of this LEGO® DUPLO® toy have been tested to the max to ensure they fulfill demanding child safety standards
Track building that connects to toy train sets – Add this set to LEGO® DUPLO® Town interactive train sets (10427 and 10428) to create an even bigger learning journey for preschool kids
Skill-building playsets – LEGO® DUPLO® build-and-rebuild interactive train toys are designed to develop toddlers’ creative problem-solving, patience, focus and perseveranceskills
Dimensions – This 20-piece set includes a tunnel measuring over 7.5 in. (20 cm) high, 6.5 in. (16 cm) wide and 6 in. (15 cm) deep

Intelli Train Track

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This set is a great addition to any Duplo train collection, offering more track and a fun tunnel element. While other Duplo train sets may include a train engine or more extensive track layouts, this expansion set focuses on enhancing existing setups with variety. It's a more affordable way to expand a Duplo train world compared to buying a whole new train set.

📦 Full Parts Inventory - 11 unique parts • 20 total pieces

Duplo Train Actio...

Part #: 35962pr0006 1× White

Duplo Train Track...

Part #: 35967 1× Reddish Orange

Duplo Brick 1 x 3...

Part #: 42025pr0005 1× White

Duplo Train Track...

Part #: 4785 1× Yellowish Green

Duplo Train Track...

Part #: 51560 1× Light Bluish Gray

Duplo Train Track...

Part #: 5370 1× Yellowish Green

Duplo Arch 4 x 10...

Part #: 5557 1× Dark Bluish Gray

Duplo Train Track...

Part #: 6378 10× Light Bluish Gray

Duplo Plant, Flow...

Part #: 6510 1× Bright Green

Duplo Plant, Flow...

Part #: 84195 1× Medium Lavender

Duplo Brick 2 x 4...

Part #: 98223 1× Bright Green

This set contains a variety of Duplo train tracks in light bluish gray and a reddish orange end-of-the-line piece. The inclusion of a train action plate adds an interactive element, making it a valuable addition to any Duplo train collection.

🛒 Where to Buy

Target

✓ In Stock

$13.99

💎 Notable Parts

Light Bluish Gray Duplo Train Track 4 x 8 Curved [Short] (10x) $1.50

Reddish Orange Duplo Train Track, End of the Line Rail Stop (1x) $0.75

White Duplo Train Action Plate with Lamp Print, Light Action (1x) $1.50

Dark Bluish Gray Duplo Arch 4 x 10 x 7 (1x) $1.00

Est. BrickLink Part Value

$4.75

💡 MOC Potential

🌳 Create a small farm scene with the tunnel as a barn entrance

🏙 Design a miniature cityscape using the tracks as roads

🏰 Use the tunnel as a gate to a Duplo castle

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 6 videos

3.0 /5

Mixed

0% positive

BlockTalk AI

The LEGO Train Tunnel and Tracks Expansion Set (10425) is generally viewed as a great addition to existing LEGO Duplo train sets, specifically the 10428 and 10427 models. Reviewers like MADABOUTLEGO showcase its integration into larger railway setups, emphasizing its value for expanding play options.

LEGO Train Track Setup and Station Expansion! Massive Train Station and 4 Bridges!

DunksterBricks • 1.3M views Review

LEGO Duplo Train Bridge and Tracks 10426

MADABOUTLEGO • 81.3K views Review

LEGO Train Tunnel and Tracks 10425

MADABOUTLEGO • 76.9K views Review

Community Sentiment

Based on 6 YouTube reviews

Not enough Reddit data

YouTube

3.0 /5

Mixed

0% positive

Positive

Mixed

Critical

BlockTalk AI Analysis

What the Community Says

5 YouTube reviews

BlockTalk AI Summary

DunksterBricks demonstrates elaborate track setups incorporating the tunnel and tracks, while Bricksie focuses on completing a large-scale LEGO City train project. Several videos highlight the interactive elements and sound features of related Duplo train sets, suggesting the expansion pack enhances these experiences.