Pandian they gave confirmed news on getting LHB some time back and also quoted RB approved. Also the news was tweeted/re-tweeted by their twitter handles. Also Pandian has got complete brand new rake compared to other trains while getting LHB rake.
All other trains there was only news/speculations but no where its mentioned as RB approved.
RF or Nellai will get next set of LHB rakes as per sources.
12685...
more... for LHB rakes after news repeatedly came on LHB rakes idling in yard for a long time and also SR didn't had much 3rd AC/Power Car. Once they got the power car they introduced it.