I've been going back and scraping some of my very early 6 wide trains and remaking 7 wide.
Remade the NIR 4000 class, replaced the inverted slopes with cheese slopes, though still some work to do at the front as the bottom section sits out about half a brick more than it should.
NIR 4000 a by snowylego, on Flickr
NIR 4000 b by snowylego, on Flickr