Diner architecture may have originated in the U.S., but railcars and trolleys turned into diners/cafes isn't unique to the U.S. The web is full of pictures of them from all over the world. (And, yes, some are McDonald's, too. :-)
Here's a link to an October Lionel Tracks post showing some very (and I mean very) creative conversions found in South Korea. There's also a video of some rail bikes that look a lot like peddle-driven speeders that connect the two converted cafes along side the tracks.
Repurposed rail car cafes (grasshoppers and fish) in South Korea
Enjoy!
Tomlinson Run Railroad