Hornby Minitrix started marketing models produced by the Trix company in 1973. By this time,the German MiniTrix company already had a number of British outline models in its catalogue, and these began to appear under the Hornby banner from 1973 onwards. However, it is possible to find early examples of what would become the Hornby range in the green and yellow polystyrene boxes as sold by Minitrix. Some other early Minitrix models took a long time to appear in the Hornby Minitrix range.

* Year is very approximate.  I have used a number of sources - one of which is copies of old catalogues that I have found - but these often represent an intention, rather than the availability of a model.  Two notable examples are the early Britannia, which first appeared as a drawing which seems to have been taken from the Trix OO guage model and probably didn't appear until the following year.  The Blue Class 27 appeared in the 1970 Trix catalogue, but didn't make it into the Hornby Minitrix catalogue until 1980 - when it was highlighted as a new model.