I'm surprised this one has attracted so little comment on here.
I don't normally buy big diesels , especially big freight diesels , - hence I'm pretty unlikely ever to purchase a Type 5 or Type 4 , and acquiring one of these isn't on my personal agenda.
But - they were the second biggest class of diesels ever to run in Britain (after the 08s) with over 500 locos built. A few are still in service , 45 years after introduction. If you are modelling a diesel operated main line between the early 60s and the turn of the Millenium you'll need a 47 or two. Or more
For what what its worth , from someone who has no intention of buying one, but has seen some photos on another site:
It's a modern high spec diesel, with the now usual centre motor , pickup all round, double bogie drive, working lights, DCC Ready etc etc. Haulage should be more than sufficent to pull anything you can hang behind it
Rivet counters suggest the rivets round the windscreen are far too prominent, and the frames to the windowns rather too prominent. Thre are some arguments about the exact bogie detail and fuel tank arrangement
But one thing that strikes me is how "right " the loco looks seen cab end one - certainly compared with the Heljan model which looks "humanoid" rather than "human" in a comparitive head on view. Given that the end on view is something I'm more familiar with than the details of bogies and pipework runs , this would tip me toward Bachmann if I were buying one (which I'm not)
The Heljan model is a modern high spec model with an excellent mechanism (albeit 1.5mm-2mm too wide - hence "tubbyduff"). I'd be surprised if there was a sudden dumping of Heljan 47s onto ebay to be replaced by the new Bachmann model. But it does look like Bachmann has an appriaciable edge