What Parts Work Together?

What makes a train stay on tracks safely? Several parts work together! The wheels have a special shape that helps them grip the rails. They aren't just round; they are slightly angled and have what's called a flange—like a lip—that keeps them from sliding off. The tracks are strong and smooth to guide the wheels properly. The train's weight also helps keep it steady.

👀 Visualize This: Draw a train wheel on a track. Label the angled part, the flange, and the rail. Now imagine if the wheel didn't have a flange. What might happen?

🧠 Pause & Think: What do you think would happen if the wheels were just flat and round?

🔧 Try This: Use two round objects like jar lids. Roll one with a rubber band wrapped around its edge and one without on a smooth surface. What do you notice?