Surely favourite liveries belong to the correct classes of engine or the company or region or train operator.
A Duchess or a Jubilee in Maroon but never a Patriot.
An A4 in Garter Blue, an A1 in BR Dark Blue but never an A3 which always looked best in Apple Green
A King or a Castle,even the Manor or Hall always in that GWR Green
A Bulleid Pacific unrebuilt best in BR green or BR Dark Blue but rebuilt always good in Brunswick, Blue or Maroon, would have liked to have seen one in a GWR Chocolate !!! Perhaps biased but I believe they would look OK in any Mid to Dark colour.
The Standards? well they only were in two colours and I think they were the right ones.
Diesels and Electrics, got to be Black.
You take your choice, me the greatest I remember is City of Lancaster in a filthy war time Black, to me that was really special.
Bernie,Born By the Brummie