the.com/coupler
the unsung hero standing between your train cars and total mechanical divorce
deadly historyLink-and-pin couplers crushed countless brakemen's hands and arms
the heroJanney's 1873 knuckle design saved thousands of limbs
self-actingModern ones lock automatically on impact, like a handshake
beyond railsOptical couplers move signals between circuits using only light
space dutySpacecraft docking systems are couplers for orbiting machines