The Brown Derby I heard fell on hard times but someone rescued it and it was not allowed to be destroyed by the historical society, but now its a different type of food place (don't quote me, its either the Brown Derby or that Donuts place that now serves bagels)... too much FoodTV and not enough braincells lol.

As for diners, its sad but not too sad, its true they came in on trains and often you found them near railway stations, but now they are being dismantled and brought to cities out in the midwest, and oddly enough, they are a big hit in Germany, so while they are "disappearing" there is foreign fascination with them and they now re-live as a part of american pop culture in other countries.