Not possible?
"A catenary dual mode could not exist in todays axle loadings.
A Genesis is about 298 000 Lbs on four axles add to that a 7 ton transformer and a rectifier group and the puppy won't fly.
and no passenger railroad in its right mind will buy 6 axle locomotives , no matter if they are C-C's or A1A-A1A."
Not possible only, if you take what is existing form GE or EMD. Weight is not only generated by the equipment, also by the carbody and the trucks. They are much more heavier in the US than in the rest of the world. So take, e.g. the ALP46, which has no more than 94t, reduce the electric power part to 4200hp and add a 4200hp diesel pack.
This shall not be possibe below 288 000lbs? For me, this approach is very pessimistic. So, why not taking actual technology driving in europe or elsewhere, you can have a 3rd rail, 25kV and diesel in one, and I'm shure, not for much more than 20% in addition to a HHP8 has cost.
So, where are the not existing possibilities?
Sorry, with such an approach, nobody would have been higher than 2000ft in the sky. No Mercury, no Apollo, nothing more.
Where is that spirit gone? I'm wondering, but still hoping.
Best wishes
Catch