I think people have somewhat missed Derek's point -- either that, or I'm about to be served up a huge portion of humble pie :s
The question isn't "What do you like?" it's "What, in your opinion, makes for 'good design'". For example, the
Porsche 911 is, for many, the perfect (sports) car -- it may not be aesthetically pleasing to all, however, it is designed to do a specific job and that (most would agree) it does admirably whilst still retaining (at least in modern guise) an incredible degree of practicality for a car of this ilk.
On the other hand, Scaglietti's
Ferrari 250 GTO is an achingly beautiful (in many people's eyes) thing and yet is not in the least bit practical.
Which, therefore, is the 'better' design? They're both sports car
It's not just about whether it looks 'nice' it's about whether it does the job it was intended for.
So, back to trains; what makes for *great design* when it comes to trains?
For me, it'd probably be one of the more modern US GE or EMD locos on grounds of practicality, e.g. the ES44 or the SD90MAC, although you've got to hand it to the venerable GP-38-2 for the 'all-rounder' title.
For our own stuff, I'd be hard pressed to commit; there's next to nothing I don't like amongst every one of the so-called 'legacy diesels' (even 31s, lol), although, if I'd have to pick one for characterfulness, I'd probably choose the old Swindon-built Type-1 'Teddy Bear' aka Class14.
Rik.