This Thomas the Tank Engine was one of a few books I did pre-press production on for LeapFrog, which also included designing and sketching concepts for story pages and activities that the LeapPad editor teams oversaw. Once the final result was nailed down the files where sent out to the in-house book cartridge programmers. Below are a few samples from the "Thomas and the School" book.
Final book and cartridge before packaging
Black and white sketch of an activity page for programming story and game elements
Final page output before being die-cut