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Ages 2+

Train Tunnel and Tracks Expansion Set (10425)

Name: Train Tunnel and Tracks Expansion Set
Brand: LEGO
SKU: 10425
Rating: 4.3 (4 reviews)

LEGO.com RRP:

£17.99

Best Price Found

€13.79(~£11.58) -£4.80 (27%)

View Deal →

Amazon DE// Last Checked: 16 Mar

LEGO.com

★4.3

(4 reviews)

★4.6

🧱 20 pieces - : £0.66

Available From

£13.19

£17.99

Free delivery

Save £4.80 (27% off)

Price checked: 17 Mar 2026

View Deal →

Best Deal

€13.79(~£11.58)

Price checked: 16 Mar 2026

View Deal →

£17.99

Price checked: 10 Mar 2026

View Deal →

£18.00

Price checked: 17 Mar 2026

View Deal →

LEGO.comOfficial

£17.99

Price updated: 17 Mar 2026

View on LEGO →

Building Instructions Brickset

Price Analysis

Lowest Price Ever

£11.58

at Amazon DE · Mar 2026

Average Price (12mo)

£15.91

Current vs Average

-17.1%

Below average

Price Trend

Falling

Last 30 days

Best Month to Buy

March

Value Score

10.0/10

Price-per-piece vs theme avg

The lowest price we've recorded for Train Tunnel and Tracks Expansion Set is £11.58 at Amazon DE in March 2026. The current price is 17.1% below the 12-month average of £15.91. Prices have been trending downward recently — a good time to buy. Historically, March tends to offer the best prices for this set.

Description

Train Tunnel and Tracks Expansion Set (10425) is a LEGO DUPLO® set with 20 pieces, with an RRP of £17.99. It's currently available from £11.58 at Amazon DE — 27% below the RRP, saving you £4.80. Prices have been falling over the last 30 days. With a value score of 10.0/10, this set offers excellent value compared to other DUPLO® sets.

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.

Features

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 perseverance skills
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

Frequently Asked Questions about Train Tunnel and Tracks Expansion Set

What is the best price for LEGO Train Tunnel and Tracks Expansion Set (Set 10425)?

The best current price for LEGO Train Tunnel and Tracks Expansion Set (Set #10425) is £13.79 at Amazon DE. This is £4.80 cheaper than the official LEGO RRP of £17.99. Price last verified on 16 March 2026.

How much can I save on LEGO Train Tunnel and Tracks Expansion Set?

You can save £4.80 (27% off) on LEGO Train Tunnel and Tracks Expansion Set by buying from Amazon DE instead of LEGO.com. The official RRP is £17.99, but you can get it for just £13.79. Browse more top discounts.

How many pieces are in LEGO set 10425?

LEGO Train Tunnel and Tracks Expansion Set (Set #10425) contains 20 pieces. At the best available price of £13.79, that works out to approximately 69.0p per piece.

What age is LEGO Train Tunnel and Tracks Expansion Set suitable for?

LEGO Train Tunnel and Tracks Expansion Set (Set #10425) is recommended for ages 2+. This set is part of the LEGO DUPLO® theme. View all DUPLO® sets and deals.

Where can I find the building instructions for LEGO Train Tunnel and Tracks Expansion Set?

You can download the official building instructions for LEGO Train Tunnel and Tracks Expansion Set (Set #10425) for free from LEGO.com. Download the building instructions here. The instructions are available as a PDF and can be viewed on any device.

Where can I buy LEGO Train Tunnel and Tracks Expansion Set in the UK?

LEGO Train Tunnel and Tracks Expansion Set (Set #10425) is available from 4 UK retailers including Amazon UK, Amazon DE, Zavvi UK and others. Prices range from £13.19 to £18.00. It's also available directly from LEGO.com at £17.99.

Is LEGO Train Tunnel and Tracks Expansion Set on sale right now?

Yes! While not on sale at LEGO.com, you can get LEGO Train Tunnel and Tracks Expansion Set for £13.79 at Amazon DE - that's 27% below the official RRP of £17.99. Browse more best offers.