Digital automatic coupling (DAC) has been developed in the 2020s to replace the English Buffers and chain couplings, initially in Europe.
It resembles the Scharfenberg coupler with extra contacts to join electrical circuits (power, detection and control) and air hoses.
Advantages
Longer trains up to 750m. Brakes remotely controlled like ECPB. Monitoring of train and wagon performance. Safety. No need for shunter to climb between buffers.
Other systems
Couplings based on AAR and SA3 already have automated mechanical couplings, so do some of the advantageous features of DAC are lessened. These have a maximum draw gear load well in excess of that possible with the DAC, say 1800m instead of 750m.