Also, those look like EMD SD70 series locomotives. I'd sperg out hard for the sake of the joke, but I also think you should keep the tag and see if anyone else says anything.
I was waiting to give my own five stars to a KLF comment.
Maybe the woman is a KLF fan. It didn't sound like she was ad-libbing it on the spot, it sounded like "Holy mother of MuuMuu" is something she says frequently as an expression of shock. And I must say, I really like it. Far more original than just dropping the F-bomb.
The irony of rolling down the window to get a better shot is that the picture is actually better when the window is rolled up. I think the exposure setting they have is too high for outdoor shots on a sunny day, so the slight tint on the windows corrected that.