BrickLink - Part 2032pb01 : LEGO Duplo, Train Wagon (fits 2 x 6 car / train bases) with Thomas & Friends Truck Face Pattern [Duplo, Train] - BrickLink Reference Catalog
BrickLink - Set 2739-1 : LEGO Tip Wagon [Duplo:Duplo, Train] - BrickLink Reference Catalog
BrickLink - Part 31285c01 : LEGO Duplo Hand Wagon [Duplo, Figure Wear & Utensil] - BrickLink Reference Catalog