Okay, I take it back. Either I need to remove the Fuel Stop mod, or encourage you to refactor and implement this!
I had 6 iron plate train limits, and I built 6 iron plate trains. My train grid deadlocked because one of the trains couldn't go to the fuel station—and train limit linter didn't show it as an issue.
Once I fixed the fuel stop and got my trains fueled, I found it in the linter. (Obviously, without the linter I'd be pulling my hair out! Thank you so much!)
Also, I think you should rename this mod "Train Linter" 👍