Another contender for LHB:
EOG-UR-UR-S1 to S13-B1-B2-A1-A2-H1-UR-UR-EOG (Total 24 coaches)
13*80 = 1040 SL berths. Currently 14*72 = 1008 berths and we get extra 32 SL berths.
8*2 = 16 extra 3AC berths
6*2 =...
more... 12 extra 2AC berths.
In case this can have 26 coaches as mentioned once by DRM, I suggest that they be S14 & S15 as more aam admi can use the train.