Thomas & Friends Toy Train Collection, Color Changers Diecast Toy Train Engines that Change Color in Warm and Cold Water. Preschool kids can recreate their favorite railway stories from the Thomas & Friends: All Engines Go!™ series with these die-cast metal push-along toy train engines with awesome color-changing action! Kids can collect their favorite characters from the series and watch as the engines change color when placed in water. It’s like having 2 engines in 1! Reveal hidden decorations on each engine by changing the water temperature from warm to icy cold (and back again). Each engine sold separately and subject to availability.?? The information provided here is as complete and accurate as possible; however, product names, colours and/or materials are subject to change without notice.