For this design, I was inspired by Japanese trains, adding soft, rounded shapes that reflect a kawaii-style aesthetic. Overall, it has a very cute and friendly look.

The train includes a driving car, a passenger car, and a cargo car. You can repeat the cars to build a train as long as you want.

Edit: I’ve added two more cars: a cargo car with higher walls and a final caboose-style car.

STL and 3MF files.

See the video: https://youtu.be/jdS36vqZH8A

No suppots needed. Make sure you have good adhesion to the print bed, if necessary use an additive. Use a little silicone spray or mineral oil (baby oil) to smooth the movement of the parts.