Duplo, Train Action Brick with White Arrow Double Pattern : Part 35962pb02 | BrickLink
Duplo, Train Action Brick / Reverse Brick with Yellow Arrow Pattern : Part 81917pb01 | BrickLink
Amazon.com: LEGO DUPLO Town Train Bridge and Tracks 10872 Toy for Kids, Building Bricks Set with Horn Sound Action Brick, Trains Rails Extension Set : Toys & Games