Siemens is not the likely front-runner for locomotives, with a proven variant of a freight locomotive preferred. I would expect a domestic production requirement.
They are going for tier IV emissions with the “possibility of carbon free propulsion” so rebuild freight units with HEP are likely off the table. For tier IV passenger units with HEP there’s the Charger, the EMD F125, and the MPI MPXpress. There are at present no tier IV passenger variants of a freight locomotive that I know of. (Though if someone knows of a model Im not aware of feel free to chime in.) So unless they are just going with new straight freight units with a separate HEP generator in one of the cars, EMD or Wabtec would have to come up with a variant for them that presently doesn’t exist.
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