One of my children (now 8) who has been with me since he was a baby has quite the train, bus and basically any transport system obsession. He does NOT like or approve of cars however! He has designed a whole transport network for the house and has even made a ticket dispenser, maps and route planners. He and the other children can be heard giving the babies lifts around the house on their ride-on-trucks, saying things like 'if you want bathroom, you're on the wrong train, please change here'. I love the thought that went into this and the confidence he has to run with his ideas and the way he got everyone else on board (sorry!). He has put so much work into it and all the other children were really engaged with this project for several months! It provided lots of opportunities for interesting conversations about the environmental impact, sustainability, building and planning. I absolutely love this and feel so proud of him!
NOTE re the plug sockets: the little babies in my care can't reach these and the older ones who can have learned not to touch them.