I had never heard of Chuggington until I was asked to make a cake for a friends little boy who was turning 5 (this is the 4th cake I have made in the last few months for a child turning 5). Any who the mom was going to buy some trains for her little boy, and we decided to incorporate those into the cake instead of me making trains out of fondant. Made "dirt" out of smashed up cookies and tried to make it as boyish as possible. Purposely made the tracks not perfect to look like it was older. I made this with a sugar free chocolate cake with vanilla butter cream.