Were there any pictures of an R68a on a A line??
Not that I know of, but I think the R68/R68A should be swapped over to the A, C and E, especially more the C and E which both run all underground with their R32's and R38 cars.
But otherwise I don't think there could be any real photo of an R68/68A car on the A C E lines, or even the Rockaway Park Shuttle.