What is in this image? Describe it in Simple English. As plain and simple as possible. No complex words, no long sentences. Still make sure to describe everything in the image.

The image shows a line of four small trains. Each train car has an animal inside. From left to right a dog with a hat, a rabbit, a sheep, and another dog. The trains look like they are for kids, with simple, cartoon-like drawings and small wheels. Each train car has some details on the top, like lines and shapes.