I am not sure but I think I saw this duronto with a WAP-7 on Sunday when it was crossing MCA. It was bit late but MAN! the speed it was acclerating, I have never seen this duronto with that speed in this section. I think I am right, as there's no another duronto in that timing, and it had SL coaches also.
I should have capture a pic atleast but before even taking my camera out its gone! :)