▁provision ▁of ▁side ▁cor rid ors ▁to ▁provide ▁access ▁down ▁the ▁train , ▁and ▁on board ▁to ile ts . ▁S leep ing ▁carri ages ▁was ▁first ▁introduced ▁in ▁ 1 8 8 7 , ▁and ▁d ining ▁cars ▁from ▁ 1 9 0 8 . ▁ ▁Lar ger ▁bog ie ▁rolling stock ▁started ▁to ▁appear ▁from ▁the ▁turn ▁of ▁the ▁ 2 0 th ▁century , ▁with ▁the ▁E ▁type ▁carriage ▁stock ▁introduced ▁on ▁The ▁Over land , ▁and ▁smaller ▁W ▁type ▁carriage ▁stock ▁on ▁intr ast ate ▁trains . ▁The ▁first ▁air ▁condition ed ▁carriage ▁was ▁introduced ▁in ▁ 1 9 3 5 , ▁when ▁one ▁of ▁the ▁E ▁type ▁carri ages ▁was ▁fitted . ▁All ▁steel ▁carri ages ▁came ▁to ▁the ▁Victor ian ▁Rail ways ▁in ▁ 1 9 2 7 , ▁with ▁the ▁construction ▁of ▁the ▁" Av oca " ▁and ▁" H op kins " ▁d ining ▁cars , ▁followed ▁by ▁the ▁S ▁type ▁carriage ▁stock ▁for ▁the ▁new ▁Spirit ▁of ▁Progress ▁in ▁ 1 9 3 7 . ▁ ▁On ▁the ▁Melbourne ▁sub urban ▁network ▁Electric ▁Multiple ▁Units ▁were ▁introduced ▁speed ing ▁up ▁services . ▁Exper iments ▁were ▁also ▁made ▁with ▁various ▁dies el ▁and ▁pet rol ▁rail c ars ▁for ▁use ▁smaller ▁branch ▁lines , ▁with ▁the ▁D ER M ▁being ▁the ▁most ▁successful , ▁remaining ▁in ▁service ▁from ▁ 1 9 2 8 ▁to ▁ 1 9 9 1 . ▁A ▁fleet ▁of ▁Walker ▁rail c ars ▁was ▁also ▁introduced ▁in ▁the ▁ 1 9