How would you do regenerative braking train couplers between engines and battery cars? (That at present have just an air hose to hold brakes open per Westinghou

How would you do regenerative braking train couplers between engines and battery cars? (That at present have just an air hose to hold brakes open per Westinghouse, but no power wiring or data cabling or a spec yet) Would standard EV charger specs work for coupling battery train cars to engines and/or regenerative braking cars? Maybe at least 1 Gbps and PoE+ to support a mesh network for sensors? Presumably hyperloop teams have solutions for this?