NS, CCT/COA, MTM, all these depots do top notch maintenance of their trains. Sabari rarely used to be delayed because of it's slack filled schedule but that changed with maintenance works in SR after a derailment. The delays started from then onwards and it used to run 2 hrs late on a daily basis and used to trail 16382 back then which had a much slower schedule than this, which added up more delay. HYB wouldn't bother with the delay as they used to send the same rake as 17256, which affected it's maintenance. Not sure how NS talked out of this arrangement and now maintenance of Sabari is in the hands of TPTY. TPTY isn't the best when it comes to maintenance. Falcon used to have RSA with Narayanadri, maintenance was horrible even then.