The annoying thing over the last 20 years has been duplication of models from different manufacturers for example lots of class 37,47 and deltics, also lots of different mk1 coaches to name a few examples, they all could of done various 1st generation dmu's and emu's and 2nd generation ones, and also the early ac electric loco's such as the class 81,82,83,84, also 3rd rail units, I think they are all finally realising now that they have run the course with duplicating diesel loco's and now they might finally be looking at doing some ac electrics, now that we have the Hornby retooled class 87, the Bachmann class 90 and the Heljan retooled class 86.