Tightlock coupler

The tightlock coupler is like the thing that connects two train cars together. You know how sometimes you build with blocks and you can put them together really tight so they don't fall apart? That's what the tightlock coupler does too. It makes sure the train cars stay connected really well and don't come apart when the train is moving. It's important to have a good strong connection like the tightlock coupler to keep everyone on the train safe and make sure everything runs smoothly.