SR might have not made use of the newer Uday coaches, and continued to use the modified DD coaches, which are being used in CBE Uday now (They are all 2012 made). SR might have used few Uday Coaches with MAS-SBC DD, but mostly as a spare. Also,all DD coaches are built in RCF only. I dont remember where I saw the pics, but the station was somewhere in Gudur line.