The other two I'm having trouble parsing are: 20,14 - I believe it's a type 2, defined by 9A. The word Trains gives all but the last letter of the answer, and the rest of the clue defines that last letter? Is that right - I can't make sense of it. Or is it in fact a type 4 after all. But I thought it had to be a type 2 due to lack of definition...
My other problem one is 17D - a type 4, I think, (doubly?) defined by the first two words - but I don't understand the rest of the clue - not in this place? Is the letter in question missing or superfluous??
Thanks for your help by the way. I often come on here and read up on the Genius if I get stuck but this time my questions hadn't (yet) been answered!