The video shows a colorful train with a pink square and a purple triangle on it. The train is moving along a track with a house in the background. The pink square is named Mr. Square, and the purple triangle is named Mr. Triangle. The video also includes text that appears on the screen, such as "MR. SQUARE DID," "TRIANGLE, MR. TRI," "LOOK LIKE A PYR," "ON MY TRAIN," and "ON MY TRAIN."