I know, that's why I mentioned the 3rd option. Maybe it's doable. Just nobody did it before, so I'm not that sure.Look. With IEP, you can turn on only one turbine instead of both, for example -- gas turbine at near full power is as efficient as diesel if not more so. Or any other engine combination that will achieve needed power -- use turbine engine at max efficiency/bulk of the need and use diesel engines to do finer adjustment.