I won't quote the post, cos it's huge - but totally agree about the train you mention.
Used it a few times and the York shire crew who are on upto Newcastle are always chipper. The Scottish crew who replace them are good too.
No idea what it is about that run, but it always stands out from any other. Not always at my wide awake best to appreciate it mind.

If you end up going again (or anyone else), the hog roast shop is a hidden gem.
Located just off the Royal Mile on Victoria Street, it is just off the tourist trail, so is very reasonable.
Just look for the roasted pig in the window!