5000 series prototype ride
Image by professionalwannabe
Yes, I did catch the 5000s prototype train once, when they were being tested on the Red Line. I had a big hunch that the train was eventually going to return southbound, and after a great bit of waiting, I finally caught it.
Ironic to think that the first actual 5000 series car will debut on the Pink Line next week supposedly, if an article I read somewhere online was true.