SainSmart Jr.Wooden Train Set Toy with Rail High Level Part, 50 PCS Flyover Overpass, HO Scale, Yellow, Multi-Level Track, For Kids 3+

Do you have to use the Lego blocks for track and train to run properly?

I am very dissatisfied&disappointed that after 3months of having this the track no longer will go together almost as if the wood is swollen it's very

We've lost a wheel rubber band, can you tell me how I can find a replacement?

It says that it has two layouts, how big is the circle layout, and does it come with good instructions?