First, spoiler alert - don't read if you do the puzzle, but haven't yet today.
With that in mind:
Clue for 14 Down is: Proportionate size for some model trains.
In a blog about the puzzle which I sometimes read was this, about the answer and clue:
As for the model trains, that clue is just perverse. G-SCALE is a perfectly normal musical thing* and you've gone and gunked it up with this dated / niche hobbyist clue (14D: Proportionate size for some model trains). I have only ever seen men and boys (always men and boys) playing with model trains on television and in movies. Never (ever) in real life. I'm fine with old men playing with children's toys, believe me, but it's bizarre to have a clue that's aimed at only roughly six such men on the planet. I hope they're happy. *technically "G major scale" but frequently just called "G SCALE"
Here's a link to the whole post about the puzzle. If you go to the comments section (a link at the bottom), a couple people (so far) have posted about having had Lionel trains.
https://rexwordpuzzle.blogspot.com/
David