The arguments for "No new DMU orders in CP5" we keep hearing are because we don't know how readily diesel will be available in 30 years time and that electrification will progress.
Another issue is that it is unclear whether it will be "normal" (petrochemical) diesel or bio-diesel that will be available, and since bio-diesel is slightly different to "normal" (petrochemical) diesel and although bio-diesel will most likely be available, it will not come on stream as a mainstream fuel while normal diesel is still available, and it may create design issues that would need to be dealt with before finalising the design.
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