Caillou: ABC Train (Puzzle Book)
"Caillou ABCTrainwas probably [my children's] favorite book. It is a board book shaped like a train. In it are miniature puzzles with the ABCs (they go 3 letters at a time). Your child can take the puzzle pieces out, look at the letters and then fit them back into the ABC Train."  —themommy-files.com"Nice, sturdy puzzle pieces can be popped out of the pages and they all connect together, ultimately forming a train alphabet. This one was probably my favorite and would make a great toddler gift."  —apatchworkofbooks.blogspot.com