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This is a clever idea. I assume part of the original idea here was "What if we could have the programming trains with signalling from Factorio and OpenTTD, but in the real world?"

It does sound pretty fun to have some kind of real world Factorio train network game...

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One of the 'tutorial game' is indeed to move resources. I think a lot can be done if the train exposes variable and counters (ie.: the colour blocks become resources, the train starts counting them, and you can write if-then-else logic around it)

There is a Scratch extension using Scratch Link to communicate with the train, so you can definitely build a program using counters and variables. See https://scratch.intelino.com/

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