Today morning i reached MAS via 12616. Worst travel experience ever. S10 coach is a really horrible with a loud rattling noise. As speed increases the rattling noise goes for a toss. Entire travel from KMT to MAS was sleepless due to this noise. When i checked the other coaches S11,S9,S8...etc all were perfect without any noise. Pity on the travelers who traveled all the way from NDLS to MAS. Wish IR should focus on the Maintenance of these long distance trains on regular basis. Do re post if anyone travelling tonight via 12615.