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o    Mechanically couples locomotives to railcars or railcars to one another, forming an integrated train unit.

2.    ‌Force Transmission‌:

o    Transmits ‌tractive force‌ during propulsion.

o    Withstands and transfers ‌longitudinal impact forces‌ during braking or collisions.

3.    ‌Buffering‌:

o    Absorbs impact energy via ‌draft gear/buffer devices‌ (e.g., connected to the coupler tail), reducing vibrations and collisions during operation.

4.    ‌Safety Spacing‌:

o    Maintains a safe distance between coupled railcars to prevent direct contact.

‌Components of Railway Couplers‌

1.    ‌Coupler Head‌

o    Core coupling mechanism enabling ‌three operational states‌: Locked, Unlocked, and Fully Open.

o    Key elements:

§  ‌Knuckle‌: Bears tractive force and rotates on the knuckle pivot pin.

§  ‌Lock/Latch‌: Secures the knuckle in the locked position to prevent uncoupling.

§  ‌Guard Arm‌: Encloses the opposing knuckle during coupling.

§  ‌Lifter‌: Pushes the knuckle to the fully open position during unlocking.

2.    ‌Coupler Shank‌

o    Primary load-bearing structure linking the head and tail.

o    Main conduit for transmitting tractive and impact forces.

3.    ‌Coupler Tail‌

o    End-connection segment, typically designed with a ‌round or rectangular hole‌.

o    Connects to the car body's draft gear via bolts or a ‌coupler yoke‌, enabling force transfer and buffering.

‌Appendix: Three Operational States‌

·         ‌Locked Position‌:
The lock secures the knuckle’s tail, preventing accidental uncoupling (operational state).

·         ‌Unlocked Position‌:
The lock is lifted, allowing the knuckle to rotate outward (ready for uncoupling).

·         ‌Fully Open Position‌:
The knuckle fully opens to prepare for coupling.