How does this seemingly loose and weak coupler hold 30 ton train cars so well? 🤔🚂 It functions like a mechanical handshake, with knuckle-shaped parts automatically rotating and locking in place when two cars meet, creating a strong, reliable connection that prevents accidental uncoupling. This design significantly improves safety over older link-and-pin systems, provides a secure, slack-free connection! #science #physics #engineering #taylorswift | Learning with Lyrics