Made this child's train set for my two year old. It's all scrap cherry. The wheels are 1.25" in diameter while the bases are 1.5" wide.
The wheels are nailed into pre-drilled holes.
The hitches are sort of a half lap joint with the top half holding a dowel.
That looks better than the description of "Train, By Mayor Jim".
Jokes aside, this is really really good work!!