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| Building a Lego train for your cats, and other Lego engineering challenges |
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| I found this video of someone solving Lego enginnering challenges to build a full-sized cat traing completely engrossing - and I don't even like Lego! |
The Brick Technology YouTube channel has a host of addictive videos showing how you can climb over walls, sink ships, cross bridges and solve other engineering challenges using motorised Lego. My favourite shows how you can overcome this sizing problem:

The production values of the videos are superb, as this screen-shot shows.
To produce a full-sized cat train:
I'm indebted (as so often) to Jason Kottke's newsletter for bringing this wonderful series of videos to my attention.
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You can also book hourly online consultancy for your time zone with one of our 7 expert trainers!
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