▁ ▁Mot ive ▁power ▁The ▁original ▁mot ive ▁power ▁of ▁the ▁J ok io inen ▁Railway ▁was ▁two ▁American ▁tank ▁steam ▁locomot ives ▁( N os . ▁ 1 ▁and ▁ 2 ) ▁which ▁were ▁built ▁in ▁ 1 8 9 7 ▁by ▁H . ▁K . ▁Por ter ▁in ▁Pitts burgh ▁Pennsylvania . ▁These ▁locomot ives ▁were ▁in ▁operation ▁for ▁over ▁ 5 0 ▁years ▁until ▁ 1 9 4 8 . ▁In ▁ 1 9 0 0 , ▁the ▁Railway ▁bought ▁another ▁American ▁steam ▁locomot ive ▁from ▁the ▁Bald win ▁Lo comot ive ▁Works , ▁and ▁it ▁was ▁given ▁number ▁ 3 . ▁This ▁locomot ive ▁was ▁soon ▁found ▁to ▁be ▁too ▁heavy ▁for ▁the ▁light ▁ 1 7   kg / m ▁rails ▁of ▁the ▁railway , ▁and ▁it ▁was ▁sold ▁to ▁Est onia . ▁In ▁ 1 9 2 2 ▁the ▁railway ▁purchased ▁a ▁small ▁tank ▁locomot ive ▁made ▁by ▁Lok omo ▁in ▁T amp ere , ▁Finland ; ▁in ▁ 1 9 3 7 ▁it ▁bought ▁a ▁large ▁tank ▁locomot ive ▁made ▁by ▁H ensch el ▁in ▁K ass el , ▁Germany . ▁This ▁locomot ive ▁had ▁to ▁be ▁given ▁to ▁the ▁Soviet ▁Union ▁as ▁a ▁penalty ▁fee ▁for ▁late ▁war ▁re par ation ▁pay ments ▁in ▁ 1 9 4 5 . ▁To ▁replace ▁the ▁H ensch el ▁lost ▁to ▁the ▁Soviet ▁Union , ▁the ▁railway ▁ordered ▁two ▁new ▁locomot ives ▁from ▁S . ▁A . ▁Les ▁At el iers ▁M ét all urg iques ▁N iv