So Durgiana Exp does Rake Sharing with KOAA-AGC Exp and loco sharing with Pratap Exp (or any other train if required). I think that KOAA-AGC & KOAA-ASR Exps can be provided a Common LHB Rake if ER & it's Sealdah Division are serious to order for it's procurement. Zonal Railways from South India like SR are hyperactive to get their trains LHB rakes :)