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From what I can see Duplo train set 10427 will have new purple and light green action bricks. Set 10428 will have new orange, dark green and purple action action bricks.

With the current trains I have seen these action bricks:

  • Red: Stops the train.
  • White: Turns the light on/off
  • Blue: Stops the train for a few seconds and plays a sound
  • Yellow: Plays a sound
  • Green: Reverses direction

What will the new colors do? Will the existing trains support the new action bricks?

From Lego.com these are the action bricks shown on 10428:

action bricks from 10428

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3 Answers 3

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So, I bought the sets myself...

The answer is not quite a simple as I thought when I asked the question, so a detailed answer follows.

About the new trains

While the old trains are black, the new trains are dark blue. The light in the front is redesigned. The light sensor underneath looks brighter. The speaker seems to have a better sound quality. The speed of the train is changed (but that is another topic on itself I might post about later).

The Action Bricks

Action Brick Existing / New Functionality with old trains Functionality with new trains Picture
Red Existing Stops the train Flashes red, plays a sound, the train backs up a bit, drives ahead faster than usual, continues ahead Existing red action brick
Blue Existing Stops the train for a few seconds while it plays some sounds, drives along No effect Blue existing action brick
Green Existing Reverses the direction of the train Flashes green, plays a sound, reverses the direction of the train Green existing action brick
White Existing Turns the light on/off Flashes white, plays a sound, drives along. The train drives forward no matter the direction it had before. White existing action brick
Yellow Existing Makes the train play a sound Plays a sound, flashes yellow Yellow existing action brick
Blue New Stops the train for a few seconds while it plays some sounds (as existing blue brick) Makes the train go a bit back and forth, flashes blue, plays a sound, the train drives on Blue new action brick
Dark green New Reverses the direction of the train (as the existing green brick) Slows the train down, flashes green, plays a sound, continues at normal speed. The train drives forward no matter the direction it had before. Dark green new action brick
Light green New No effect Stops the train, flashes green and plays a sound Light green new action brick
Orange1 New Turns the light on/off (as the existing white brick) Stops the train, flashes red and plays a sound Orange1 new action brick
Orange2 New Stops the train (as the existing red brick) Stops the train, flashes red and plays a sound Orange2 new action brick
Yellow New Stops the train (as the existing red brick) Makes the train go a bit back and forth, flashes yellow, plays a sound and stops the train Yellow new action brick
Purple New No effect Plays a sound, flashes purple, continues driving for a while in this state. The train drives forward no matter the direction it had before. Purple new action brick

Effect on each other

While the existing trains read one action brick at a time and thereby do not affect each other, the new trains are different. For instance, when the yellow action brick makes the train play a sound the train will not respond to any subsequent action bricks it drives over while the sound is playing.

Changing behaviour

I have noted that the effect each action brick has is not always the same. For instance, usually the red brick makes the train drive fast for a bit, but on rare occasions the train stops instead. I do not know if this is a feature or a bug.

The App

I have yet to test the app, but will update the answer once I do try it.

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    Effect from actions bricks (especially old ones) on new trains doesn't seem to make a lot of sense. Commented Jan 9, 2025 at 6:13
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Looking at the description in the specification for 10428 which states:

They can load the train with cargo, charge the engine or wash the carriages. Each activity is brought to life with lights and sounds when the toy train passes over one of the 5 action bricks.

I imagine that they trigger different sounds from the engine, such as running water, zapping/charging or general clanking, based a little bit on the pictures and that description

Set 10427 also offers:

The 3 action bricks bring play to life, prompting the toy train to make realistic noises as it passes over them, boosting toddlers’ prediction skills as they guess what sound the train will make. They can also use the special customization brick to play their own sounds recorded using the free LEGO® DUPLO® Interactive Trains app, which also lets them drive the train using a portable electronic device.

Again suggesting that the bricks will trigger specific sounds (birds/woodland, etc.) judging by the video on that page, the Red "House" brick acts as a Stop brick.

I expect the older trains might pick up some of the bricks for example this answer from Jan 2024 notes that the sensor was cycling through a series of colours to find a match, so the more recent trains may well do something for some of the colours.

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    Fully expect a better answer to be provided once these sets are released in Jan, but there wasn't enough room in a comment ;) Commented Nov 27, 2024 at 16:46
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    I have been wondering why nobody had yet bought one of these just to answer the question, but the train not coming out for another month explains it. :) Commented Nov 27, 2024 at 18:20
  • Sadly my expertise with Duplo trains stopped about 12 years once the kids moved on to System. Did still dig it out now and again for visiting relations when they were interested. Commented Nov 28, 2024 at 13:17
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A new app for controlling Duplo trains has also been released in December. It says that it is compatible with the old trains, but does not indicate whether they will interact with the new coloured pieces.

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  • Do you have a link, a name of the app or the source of the information? Commented Dec 26, 2024 at 22:11
  • play.google.com/store/apps/… Commented Dec 28, 2024 at 21:19
  • It is a new application where the two new Duplo train sets that will be marketed in January are already shown. It is different from the one that already existed. And in theory there are the purple pieces that would allow recording Commented Dec 28, 2024 at 21:27
  • It'¡s the new app for old train and new train Sorry for my English, In my tablet i have the new app and the old, but I only have the old steam train and I can't test the new app in all its functions, since the new train sets in the online store in Spain say they will be released in January. I have written to Lego Spain asking if the old trains will be compatible with the purple bricks, but I still haven't received an answer. New: Train Duplo set 10427 and 10428 [New duplo train](lego.com/e Commented Jan 1, 2025 at 6:23

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