Another vote here for Class 66...
Okay, the Bachmann model is the correct general shape and captures the overall look reasonably well, however there are many shortfalls. To start with the general detail is woefully lacking, particularly below the solebar/underframe and fuel tank areas - key areas for a machine where the emphasis is on the solebar due to the cutaway design of the prototype. The body isn't the sharpest of mouldings, with much detail looking a tad 'rounded', particularly around the cantrail area and even the bodyside ribbing, whereby current standards all of this should indeed be quite 'crisp',
The bogies aren't great either - firstly in terms of capturing the weighty look that bogies should have; and secondly, most models I have ever bought suffer from the body slumping clumsily directly onto the bogie frames (usually more at one end than the other), leaving you with a drunken looking and often wobbly-running model.
There is something about the general look too, in that the Bachmann 66 somehow doesn't look like a weighty piece of kit sitting on the track (unlike for example the Hornby Class 60, which scores highly in this respect). Maybe it's a combination of fairly poorly represented bogies, the somewhat sparse underframe and the way the model generally sits?
On a positive note however, the best part of the Bachmann model is in my opinion the cab, which really does look very good, and is if anything what perhaps carries the model by distracting from the other more inadequate areas of detail.
Interestingly, being of similar outward design I had high hopes for Dapol's 59, however it does look as though Dapol have indeed lifted many ideas from Bachmann's 66 and as I see it have failed to again capture that important 'weighty' look that any locomotive should have, not to mention somewhat insipid looking bogies to match.
As for features, well, I'm not sure what could be added in addition to your suggestions of more complex light sequences and top-notch sound. I'm not overly convinced that a 'diesel smoke system' would be all that convincing, and to be honest isn't something I have ever craved in a model, however I am always prepared to be pleasantly surprised! In short, something produced to the same level as your Class 156 would be truly amazing, in terms of lighting, sound, detail etc etc...
Lastly, other points in favour of producing a new Class 66 are that this locomotive type (love 'em or hate them), is as we all know the most common piece of kit on the current network, and has been for the last 20 years, and may well be for the next 20 years, in one form or another. Already there are a crazy amount of livery variations, and I'm sure there will be many more before their time is up. If any prototype would stand up to more than one manufacturer producing a model then it must surely be the 66, after all you only have to look at how Bachmann keep on churning out version after version of what is now, in my honest opinion, a very tired representation of the prototype.
Edited by YesTor, 28 November 2017 - 16:09 .