We were so happy to receieve our purchase of this track set for our 35 month old grandson's Thomas the Train set here at Grandma and Papa's house. We babysit him a couple days a week and he plays for several hours each day with his Thomas set. He arranges and rearranges tracks and engines. Sometimes the track circles tend to be too tight, but this set has made the curves a bit larger so now when he is moving 15-20 engines around the curves, there no more "accident"! It's a really terrific addition to our set! The ability to move openings from male to female, and vice versa is also a blessing!!