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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)

Prices last checked: 1 May 2026 at 18:53

LEGO.com RRP:

£17.99

Best Price Found

€13.76(~£11.56) -£5.20 (29%)

View Deal →

Amazon DE// Last Checked: 1 May

LEGO.com

★4.3

(4 reviews)

★4.6

🧱 20 pieces - : £0.64

Available From

£12.79

£17.99

Free delivery

Save £5.20 (29% off)

Price checked: 1 May 2026

View Deal →

Best Deal

€13.76(~£11.56)

Price checked: 1 May 2026

View Deal →

£17.99

Price checked: 10 Mar 2026

View Deal →

£18.00

Price checked: 1 May 2026

View Deal →

LEGO.comOfficial

£17.99

Price updated: 1 May 2026

View on LEGO →

Building Instructions Brickset

Price Analysis

Lowest Price Ever

£11.56

at Amazon DE · Apr 2026

Average Price (12mo)

£14.14

Current vs Average

-9.5%

Below average

Price Trend

Falling

Last 30 days

Best Month to Buy

May

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 £11.56 at Amazon DE in April 2026. The current price is 9.5% below the 12-month average of £14.14. Prices have been trending downward recently — a good time to buy. Historically, May tends to offer the best prices for this set.

Price History & Buying Verdict

VerdictGood time to buy

•The current best price of £11.56 is within 5% of the all-time low we've recorded (£11.56 at Amazon DE, April 2026).
•Prices have trended downward over the last 30 days — there's a chance of a further dip.
•On price-per-piece, this is one of the better-value sets in the DUPLO® range (value score 10.0/10 vs theme average).

We've been tracking the price of LEGO DUPLO® Train Tunnel and Tracks Expansion Set (20 pieces) for 107 days, recording 75 data points across LEGO.com and major UK retailers. Over that period the price has dropped 1 time below previous levels, with the lowest price ever recorded being £11.56 at Amazon DE in April 2026.

The 12-month average sale price for set 10425 works out to £14.14 — that's 21.4% below the LEGO RRP of £17.99. The highest price we recorded across our tracked retailers was £18.00, giving a range of about £6.44 between the cheapest and most expensive observation.

Amazon UK has run the most price drops on this set in the period we've tracked, making it the retailer most worth watching for short-term deals. Historically, May has produced the lowest average prices for Train Tunnel and Tracks Expansion Set, so if you're not in a hurry it's worth bookmarking the page closer to that window. Prices have been trending downward over the last 30 days.

Want to see how LEGO Train Tunnel and Tracks Expansion Set (set 10425) compares against other sets? Browse the best-value LEGO sets or check the full price-history tracker.

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 £11.56 at Amazon DE — 29% below the RRP, saving you £5.20. 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 £13.76 at Amazon DE. This is £5.20 cheaper than the official LEGO RRP of £17.99. Price last verified on 1 May 2026.

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

You can save £5.20 (29% 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 £13.76. 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 £13.76, that works out to approximately 68.8p 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 £12.79 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 £13.76 at Amazon DE - that's 29% below the official RRP of £17.99. Browse more best offers.

What is the lowest price ever recorded for LEGO Train Tunnel and Tracks Expansion Set?

The lowest price we've recorded for LEGO Train Tunnel and Tracks Expansion Set (Set #10425) is £11.56 at Amazon DE in April 2026. That's 36% off the LEGO RRP of £17.99. Track the latest movements on our LEGO price history page.

Is LEGO Train Tunnel and Tracks Expansion Set good value for money?

Comparing piece-count to price across the LEGO DUPLO® theme, this set scores 10.0 / 10 for value. That works out to about 68.8p per piece. That puts Train Tunnel and Tracks Expansion Set in the top tier of DUPLO® sets for raw build value — you're paying noticeably less per brick than the theme average. Compare against other contenders on our best-value LEGO sets page.