Watching the big loader.

The basic unit picks up various top pieces on a chassis. They are a truck, a scoop and a small hopper. It runs around the track picking up balls and putting them in a large hopper, distributing them, scooping them up and returning them to the hopper. It is fascinating.  Booboo was a bit mesmerised.  The toy is very old - I think it came out in the 1970's. We have had it for about 30 years. It is a real feat of engineering.  The truck is designed to reverse where appropriate. 

Here's a YouTube video to show how it works. The reviewer says its the best toy ever. It is really good. I would fast forward to 7 minutes 57 secs.https://youtu.be/tgnbEFuSlXY?si=TFAVPr0FBeZ3_yt-