LEGO® DUPLO® Connected Train 4+

For Bluetooth Train Playsets


    • 4.4 • 3.4K Ratings
    • Free



"This app may be used with or without the LEGO® DUPLO® Cargo Train (10875) or LEGO DUPLO Steam Train (10874).


All aboard the DUPLO train! Join the train driver in an exciting adventure on the DUPLO railway. Help the driver by controlling the train’s speed, turning on the headlights, sounding the horn and more!

As part of a brand new experience, your child can collect more than 20 different stickers and place them in the inspirational DUPLO train landscape. In this experience we also have fresh, intuitive controls, including a new color-changing light button.

With the train sets you can place DUPLO action bricks on the rails to make the driver react to your actions. Each action brick can also launch an exciting activity to add even more fun and inspire play with your physical train set.

You can also play without the physical trains and will be able to join the driver on fun activities, collect stickers and have the app react to your actions.

Come with us on a joyful ride and enjoy great fun with LEGO DUPLO Connected Train.

Intuitive and easy interface for children to navigate and control the physical and digital train
Fun toddler-friendly visuals and interactions
Trigger events in the app with the physical action bricks
Help the driver go on adventures, and complete age-appropriate activities
Easy connection instructions – open the app, choose your train in the main menu, turn on the physical train and the connection will happen automatically
No in-app purchase
No third-party advertising
No third-party data tracking
Parental gate to access information about LEGO DUPLO and further information about the app"

Why play with LEGO DUPLO?
LEGO DUPLO aims to be your Partner in Play when it comes to your child’s growth and development from age 1 1/2. We work with child development experts, educators, and parents to ensure that all LEGO DUPLO products – both in real life and in games like this – deliver value, safety, versatility, and an outlet for creative thinking that will set the stage for a love of learning and play that will last a lifetime. Thank you for allowing us to be part of your child’s journey!

For app support contact LEGO Consumer Service.
For contact details refer to

We will utilize your personal information to manage your account and review anonymized data to provide a safe, contextualized and excellent LEGO experience. You can learn more here -
Our privacy policy and terms of use for apps are accepted if you download this app.

LEGO, the LEGO logo, the Brick and Knob configurations and the Minifigure are trademarks of the LEGO Group. ©2022The LEGO Group.

What’s New

Version 1.8.21

Minor bug fixes

Ratings and Reviews

4.4 out of 5
3.4K Ratings

3.4K Ratings

WarzauWynn ,

Great little companion app

When I saw this app and th activities I wasn't all that interested, but my 3 year old loves it! He was able to figure bout how to do simple things, but not all the activities, so hopefully he can struggle through figuring out all th activities.

I quickly found what I assume is a small bug: when activities are disabled in the app (which is how I would want to use the app pretty much all the time) the light functions don't work. Interestingly, even the light brick doesn't work when the train is connected to the iOS app and activities are disabled.

Developer Response ,

Thanks for your review, we're thrilled to hear he loves it! 😊 You're right, the functions of the app and light will change if Activities are not enabled. We let our team know, just in case it was unplanned. 🔧📱 - Michael, LEGO® Customer Service

carlisle wheeling ,

A Fantastic Extension for Lego Duplo Play

My son and I love how this extends our Lego building play. We have both the freight and passenger locomotives and enjoy running both of them together at the same time (using separate phones and apps). We have purchased the additional track sets, as well, and have created very elaborate track layouts.

I only have a couple points that would be great to be fixed for the App:

First, as other reviewers have mentioned, the train controls in the app are close to the screen’s edge making it too easy to accidentally swipe and access iOS screens like “Notification Center”. And when you do, it often disrupts the Bluetooth connection — sometimes requiring turning the train off and on again to reconnect. This can be rather frustrating for me, let alone a 3-year-old. A work around to this problem is to turn on the phone’s “Guided Access” to limit any out-of-App functionality.

Second, the train whistle or refilling water sounds used to come directly from the locomotives. Now the only sounds come from the App or are absent altogether. This is disappointing since the control of the actual train whistle and external sounds was a fun part of the overall experience. I hope it’s just a glitch in the latest app update and will be fixed soon.

Overall, this app and the trains have provided so many hours of fun for my 3 year-old and myself. Thank you!

Developer Response ,

Thanks for your detailed review. 🤗 We're happy you two have hours filled with fun with your trains. 🚂✨ We'll make sure to pass on your feedback to our team. As for the sound not working: We'd actually like to have a closer look into it and fix it for you. Please get in touch at, and we'll get it sorted! 💪 -Gabriela, LEGO® Customer Service

morganb67 ,

Obviously not tested on children

Virtually every control for the train is right on the edge of the screen, and you slide your finger to operate the controls. Well, guess what? Apple engineers use the exact same ‘swipe from the edge’ motion to switch between apps. Try explaining to a 2 or 3 year old that they can’t actually touch the edge of the phone when trying to grab the speed control knob which is literally .1” away from the edge of the screen. If your child isn’t exactly precise in their finger position they end up starting to switch between apps, and the instant you begin to switch apps, the Bluetooth connection is disconnected and you must wait about 5 seconds for it to reconnect. Incredibly frustrating. Even more so when you realize all the LEGO developers had to do to discover this issue is let one or two children use the app for all of 5 minutes before they realized how big of a design flaw this layout is.

Developer Response ,

Hi there, you mentioned a very good point that affects the user experience for this app. Feedback like yours is highly appreciated and it helps us improve the app as much as possible. Thank you again for your honest and constructive feedback! - Samuel -

App Privacy

The developer, LEGO, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Contact Info
  • User Content
  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

More By This Developer

LEGO® Builder
LEGO® Life: kid-safe community
LEGO® Super Mario™
LEGO® Brawls

Apple Arcade

LEGO® Builder's Journey

Apple Arcade


You Might Also Like

Chuggington Traintastic
Thomas & Friends: Magic Tracks
Thomas & Friends Minis
Chuggington Ready to Build
Thomas & Friends: Go Go Thomas
Transformers Rescue Bots Hero