None in regular operations ( I thought the Kalka mail runs with 25, but I am not sure), but on rare occasions, trains like Godavari and Gautami have been reported to have run with 25 coaches, apparently due to overwhelming rush. I remember traveling by Gautami sometime in 2008 or so, when an extra SL coach was added at the end of the train ( I traveled in the extra coach). I am not sure if she was already a 24 coacher at that time, but she was already one of the longest rakes on the route.
But SCR was one of the first zones to move to 24 coaches for all of it's premier trains,...
more... and during the initial days, they would have tinkered with running trains with 25 coaches, even though they don't do it anymore. Gautami express has been marked for augmentation to a 26 coach rake according to some reports last year ( rake has been converted to CBC now, so probably a preparation for augmentation).