Step 1: Prepare some square origami. Different colors of origami are colorful and look better.

Step 2: Fold the origami in half, then open the origami and fold it into creases.

Step 3: Fold the origami along the center line.

Step 4: Fold the origami upward again.

Step 5: Fold the origami back.

Step 6: Fold out another identical origami and cross it.

Step 7: Open it from the middle and flatten it, as shown in the figure.

Step 8: Open the origami and a train car will be folded.

Step 9: Fold out three train carriages of different colors.

Step 10: Prepare a quarter of the origami just made.

Step 11: Fold the origami into two shapes in the same way.

Step 12: Connect the two ends together.

Step 13: Connect the origami head.

Step 14: unfold the origami from the middle.

Step 15: Fold out seven identical ones.

Step 16: Stick the folded origami together.

Step 17: Use the extra one as the locomotive.

Step 18: Prepare a piece of paper and stick it with double-sided adhesive.

Step 19: Connect each car of the train with strips, so that the small train can be folded. Is it simple?

Method 2

Dear friends, let's first fold a line in left and right with square colored paper, then open it, then fold the midpoint of the lower left and right edges in half, then fold the left and right corners along the midline, and fold them from left to right in turn, as shown in the figure.

Little friends, let's fold another one, put the two together according to the picture, and then open a cuboid that will appear immediately, as shown in the picture.

Dear friends, then we take a square piece of colored paper, the smaller one, fold it and insert it according to the previous method, just hold it up to form a cylinder, and then we make three identical cuboids and seven identical small cylinders, as shown in the figure.

Dear friends, we stick six small cylinders with double-sided tape, and then stand on the cube every two. The remaining small cylinder is glued to the head of the first cuboid and used as the chimney of the locomotive, as shown in the figure.

Dear friends, let's take out a rectangular piece of colored paper, stick double-sided tape on it, and connect three train carriages, so that an origami train is completed, as shown in the figure.

Summary:

1. Fold a line from edge to edge with colored paper, fold the left and right sides along the middle, and fold two corners along the center line.

2. Fold another one and insert it together as shown in the figure to form a cuboid and prop it up into a cylinder.

3. Six small cylinders are bonded with double-sided tape to form a locomotive chimney, and rectangular colored paper is bonded with double-sided tape to connect the train compartment.

Matters needing attention

We can choose the color according to our preference when folding.

When folding, we can fold three cars or four cars.