BUMP
Ok I'm finally done, some sleep does help :>
But still I guessed it with your hint, without finding the source

Snowdon weird transport does it, with dragons showing up in the second page of results :3
Oops, intended to reply to above

Took me a long while to switch from the fictional Sodor to Yr Wyddfa (I was tired, I almost fell asleep sitting at the pc after I'd read such an amount of info about Thomas and his friends that I could challenge any 3 year-old kid to a quiz battle), and then a long while to search different names of places 140 km SE of Yr Wyddfa and special ways of travel between summit and place, and then giving up and reading some mythology for fun and find a mention of two dragons in the myths, so I just tried to enter "dragon". Should have been simple enough tho, since it's Wales, of course the answer is "dragon".

finally stumbled upon sometihing :)
Have to search for 13+18+19 yet.... even tho i can already tell you how many passengers will be on these cars. (But does it help?^^)

Struggled for a few days, but finally managed to solve it through brute forcing random stuff. Personally, I'd call that South, not SouthEast.

I actually wrote a bit lengthy post about my struggles but then solved it right after posting. :p
I was going to threaten you for hints with your weakness. But oh well, once again your plot armor wins. XD

All that work for a game ... about a dragon. ;) I guess I know more about England, Wales, Railways and the origins Thomas the train before this started. I should have looked at the missing games in the original post for hints. Thanks for the puzzle OnlyTwin!

Bump!

Found this Here be Dragons: The Snowdonia Chronicle.

And thank you very much again ;)