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    Check device online
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    3. LEGO® DUPLO® train

    LEGO® DUPLO® trains: online control

    Connect LEGO® DUPLO® trains 10427, 10428, 10874, or 10875 via Bluetooth to test movement, speed, stopping, headlight colors, and built-in sounds.
    Train is not connected
    Turn on the train and keep it near this device.

    Movement

    0%
    0%

    The train moves at 10% in silence. Speak louder to increase power up to 100%. Use Backward and Forward to choose direction.

    Off

    Say “Forward”, “Backward”, “Stop”, a headlight color or “Turn off the lights”.

    Headlight color

    Sound test

    How to connect a LEGO DUPLO® train

    This browser controller works with the LEGO DUPLO® Interactive Adventure Train 10427, Big Interactive Community Train 10428, Steam Train 10874, and Cargo Train 10875. You can drive the train directly from your browser without installing the official app.

    1. Open this page in a browser that supports Web Bluetooth on a device with Bluetooth enabled.
    2. Press the green power button on the underside of the locomotive to turn the train on, then place it close to your phone or computer.
    3. Press “Connect train” and select the LEGO train in the browser window.
    4. Confirm Bluetooth pairing if the browser asks for it, then wait for the connected status.

    Compatible trains and controls

    The controller supports the interactive models 10427 and 10428, plus the classic Steam Train 10874 and Cargo Train 10875.

    • Move forward or backward, select power from 0% to 100%, and apply a smooth brake.
    • Change the headlight color, blink the lights, or run a color cycle.
    • On interactive models 10427 and 10428, play the horn and starting sound. On classic models 10874 and 10875, play braking, station departure, water refill, horn, and steam sounds.
    • Use the buttons, keyboard arrows, voice volume, or supported voice commands.

    Browser and permission requirements

    Web Bluetooth is supported in compatible Chromium-based browsers, such as Google Chrome and Microsoft Edge, on Android, Windows, and macOS. On iOS, use a separate browser with Web Bluetooth support: Bluefy or WebBLE.

    An enabled Bluetooth adapter and your confirmation in the device picker are required. Microphone permission is optional and is requested only when you enable one of the voice-control modes.

    If the train does not connect

    1. Move the train closer, switch it off and on, and open the device picker again.
    2. Disconnect the train from the official app or another device: only one active Bluetooth connection may be available.
    3. Reload the page and check the site’s Bluetooth permission if the previous connection was rejected.
    4. If the train connects but ignores commands, disconnect it here and pair it again.