McDonald's, A&W Root Beer and White Castle are mainstays of American fast food. I'm not sure of the White Castle story and its history but McDonald's is obviously very well known. A&W was always a drive in where you could get burgers and stuff like that brought to your car.
Back when the American diet was mostly eat-at-home I bet visiting these places was a real treat. I think things have changed a bit since these signs were used at real restaurants. This is a slice of what I think are the 50's or 60's at a replica working diner at The Henry Ford museum in Dearborn, Michigan.
I shot this handheld, three exposures but wasn't happy with both the noise and bit of camera shake I introduced on the longest exposure so I worked on a single exposure and tweaked it a bit to get the neon of the sign to pop.