Following on from the recent discussion about why class 86/1's & 86/2's were not the other way round, this leads me to another question, piffling trivia if you will!   There were some gaps in the TOPS numbering scheme. There was a full house between class's 20 & 29, then there was class 30, the original designation for the Brush/Mirrlees type 2, and 31, the EE re-engined class 30's. Class 33's  I understand were originally going to be class 33 & 34, but this was changed to 33/0 &am