Car Gwyllt wasn't just used at Graig Ddu. For instance, an old quarryman told a friend of mine that he used one on the Oakeley Chamber 34 incline back in the day.
Speaking of that area and the NLW photos, have a look at this one:
🔗101382[linkphoto]101382[/linkphoto][/link]
I don't think it's the Queen Mary Caban though it rather looks like it (taken from the door). If it is a different one, it must look extremely similar to how the Queen Mary Café must have looked, don't you think?
Beneath my steely exterior beats the heart of a dashing hero