What's the best toy you've bought for your vehicle obsessed 4 year old?

[perfectpanda]

He loves his train set and regularly sets up a 'city' - we have one of those road mats, loads of small cars and a garage. Does anyone have a recommendation for a good set to get him for a 4th birthday present?

Sit on excavator to use in the house/garden. My 3 year old is obsessed with vehicles and loved this.

Hot wheels went down well here - lots of different sets to choose from depending on budget. But if he likes the train set, why not go with that? Both DSs here liked theirs enormously, so we got things like extra stations, bridges, tunnels, viaduct, sheds, water cooler, points, shapes of track with junctions etc, windmill, repair shed etc.

Way to play road track?

I wondered about the way to play Road track but the reviews are a bit rubbish - the pieces being hard to put together and stay together. He is 4 though so bit different to a young 3 year old.

Magic tracks
AquaPlay Lock box
Chad valley remote control crane