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I have a battery-operated Christmas train and would like to make it remote-controlled but don't know what I need to buy for a transmitter and receiver. Could someone please tell me?

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Power Functions

I understand the train you have is Winter Holiday Train (10254). Luckily, LEGO has already has thought about it and have an option to power up this train. If you still have instructions check the last pages where you can find the list of elements you need (also pictured below) as well as 11 more steps you need to follow to get them installed.

In my opinion, 8879 controller pictured here is way much better than other Power Functions controllers, simply because you only need to set the speed once and train will keep running. Unlike the other types, where you have to keep pushing control toggle to keep your train moving. All of them can be found on Bricklink.

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Powered Up

Since Power Functions elements are no longer sold by LEGO you have to look for other means of acquiring them new or used. However this system has been superseded by entirely new system called Powered Up. In some way it is even better for trains since you no longer need a place for bulky IR Receiver. You would need following elements to motorize your train with Powered Up:

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    Wish to point out that you don't need the remote control AND a smart device if you go the Powered Up way. You can choose between the two.
    – Michael Verschaeve
    Commented Jan 28, 2021 at 20:29
  • @MichaelVerschaeve thanks for spotting this. I, somehow, missed that. Probably due to my (constant) association of PuP with Bluetooth/smart device.
    – Alex
    Commented Jan 28, 2021 at 20:44
  • I neglected to say its not a lego its cheaper train, sitting here on line I cant think of the make but I would still like to make it a remote I do Know its G scale.
    – Edward k. Stenger
    Commented Jan 28, 2021 at 22:47
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Over the years, Lego has made many kinds of motors. But for the most recent ones, they sell a remote control receiver which is controlled by a handheld remote control.

receiver control

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  • Given Powered Up, this is not the most recent solution and actually the components have gotten hard to find. But since the OP hasn't specified which motor he has, it's likely to be a power functions motor and this answer is correct.
    – Michael Verschaeve
    Commented Jan 28, 2021 at 16:41

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