Coupling facilitates inter connection of rolling stock to form a train. Due to certain limitations of age old srew coupling system, CBC becomes the most useful & viable choice. There are certain features of CBC which makes it an unanimous choice & extensively used in most of the freight cars, EMU coaches & all of the LHB coaches of Indian Railways.

Saliant Features

It transmits both draft & buffing load between vehicles and to/ from under-frame. It absorb high frequency forces during impact & dissipates low frequency forces to protect the vehicle from damage. It has got multi functional units like Draft+Buffing & Automatic FP+BP connections.

Advantages of CBC

Automatic coupling type & Quick detachment possible, which in turn is safe for shunting staff & reduces time required.

Less staff for uncoupling.

Prevention of uncoupling in the event of derailment/accident.

Anti-climbing feature (for LHB coaches) to prevent damage to life & property during accident.

Types of CBC adopted in IR

AAR E/F type used in wagons.

AAR(H) type Tight lock used in LHB coaches.

Dellner Coupler used in LHB coaches.

Rigid Type Schaku coupler used in DMU/EMUs.

Slackless drawbar in BLC wagons.

Transition coupling (e.g. in BOBYN).

Hook type in MG/NG stocks.

Main Components of CBC

Coupler body - Knuckle - Lock.

Knuckle thrower.

Lock lifter assly.

Yoke,Yoke pin,Yoke pin support.

Striker casting.

Draft Gear.

Uncoupling device.

Back Stop


Fitted with coupler head. Used to couple two coupler heads of two coaches/wagons.