, ▁a ▁How rah ▁based ▁W AP - 7 ▁ha uls ▁the ▁train ▁for ▁the ▁remainder ▁of ▁its ▁journey ▁until ▁How rah . ▁ ▁Before ▁ 6 ▁June ▁ 2 0 1 5 , ▁this ▁train ▁was ▁used ▁to ▁be ▁ha u led ▁by ▁a ▁Kal yan - based ▁W C AM ▁ 3 ▁locomot ive ▁from ▁M umb ai ▁CS MT ▁to ▁Ig at p uri . ▁ ▁History ▁Kol k ata ▁Mail ▁as ▁it ▁is ▁known ▁now ▁is ▁one ▁of ▁the ▁oldest ▁train ▁of ▁Indian ▁Rail ways ▁with ▁service ▁of ▁ 1 5 0 ▁years . ▁This ▁train ▁was ▁started ▁by ▁the ▁British ▁Indian ▁Government ▁on ▁ 7 ▁March ▁ 1 8 7 0 ▁and ▁was ▁operated ▁by ▁the ▁Great ▁Indian ▁Pen ins ular ▁Rail ways . ▁At ▁that ▁time ▁this ▁train ▁was ▁known ▁as ▁the ▁Imperial ▁Indian ▁Mail ▁and ▁use ▁to ▁carry ▁British ▁Offic ers , ▁Civil ▁Serv ants , ▁Diplom ats ▁and ▁their ▁family ▁members ▁from ▁the ▁then ▁Bomb ay ▁to ▁Cal cut ta . ▁At ▁that ▁time ▁it ▁was ▁one ▁of ▁the ▁most ▁lux ur ious ▁train ▁of ▁British ▁India ▁and ▁the ▁world . ▁Later ▁on ▁after ▁independence ▁the ▁name ▁was ▁changed ▁to ▁Bomb ay ▁Mail , ▁which ▁then ▁subsequently ▁changed ▁to ▁M umb ai ▁Mail ▁after ▁re ch rist ening ▁Bomb ay ▁to ▁M umb ai . ▁Being ▁a ▁very ▁popular ▁train , ▁Indian ▁Rail ways ▁has ▁to ▁start ▁another ▁train ▁by ▁the ▁same ▁name ▁but ▁via ▁Nag pur . ▁Later ▁on ▁to ▁avoid ▁confusion , ▁Indian