A Lego Fest

Harry and I had a lego fest this evening. All the Duplo came downstairs from his bedroom, we pushed back the furniture in the lounge and set to building...

Two of the trains are electronic, but one is much faster than the other.
So the challenge is to load The New Super Speedy one and free up The Old Faithful, so the inevitable crash is a longer time coming.

This provides endless delight - and some quite good engineering learning - for a 6 year old. Here he is, wondering when the engines are going to merge!