Voith Turbo, in cooperation with Siemens Mobility and ÖBB, has conducted trial installations of hybrid freight couplers on two Siemens Vectron locomotives. The objective was to evaluate installation conditions and component interactions under practical circumstances, with a focus on preparing rolling stock for the transition toward digital automatic coupling (DAC) in mixed fleet operations.
Field testing of hybrid coupling systems
Two hybrid coupler systems were tested: the “CargoFlex Hybrid” developed by Voith Turbo and the “Hybrid Link” from Knorr-Bremse Rail Vehicle Systems. Both are designed to allow locomotive coupling regardless of whether the wagon end is fitted with a DAC head or retains the conventional UIC screw coupler. The trials took place with technical support from Siemens and Austrian operator ÖBB.
The tests confirmed mechanical compatibility in DAC mode between the two hybrid systems and demonstrated that connection with traditional UIC-type wagons is technically feasible. These findings are intended to support transition planning toward full DAC deployment by allowing mixed compositions during a multi-year rollout phase.
Implementation adjustments identified
The fieldwork also identified a range of practical conditions requiring further adjustment before the couplers can be installed in regular service. These involve dimensional checks, mechanical tolerances, and integration parameters that were not fully apparent in simulation or workshop settings.
The tests contribute data for the ongoing Full Digital Freight Train Operation framework coordinated under Europe’s Rail Joint Undertaking. No specific timeline for series installation or regulatory certification was included in the test summary, and no cost information has been disclosed. Hybrid coupler retrofitting is considered a temporary solution in the migration process from UIC screw couplers to full digital couplers across European rail freight networks.
