▁were ▁the ▁first ▁tank ▁locomot ives ▁in ▁public ▁passenger ▁service . ▁▁ 1 8 4 1 ▁saw ▁the ▁D & K R ' s ▁Grand ▁Canal ▁Street ▁railway ▁works ▁build ▁the ▁ 2 - 2 - 0 T ▁well ▁tank ▁Princess ▁which ▁was ▁the ▁first ▁locomot ive ▁in ▁the ▁world ▁built ▁by ▁a ▁railway ▁company ' s ▁own ▁work shop . ▁ ▁Princess ▁was ▁also ▁noted ▁for ▁being ▁modified ▁to ▁fit ▁the ▁ ▁profile ▁of ▁the ▁Dal key ▁At mos pher ic ▁Railway ▁and ▁worked ▁that ▁line ▁for ▁the ▁period ▁ 2 3 ▁December ▁ 1 8 4 8 ▁to ▁ 5 ▁February ▁ 1 8 4 9 ▁when ▁the ▁atmos pher ic ▁system ▁broke ▁down . ▁ ▁Grand ▁Canal ▁Street ▁also ▁produced ▁a ▁series ▁of ▁locomot ives ▁for ▁the ▁D & K R ▁after ▁Princess , ▁the ▁list ▁includes ▁such ▁names ▁as ▁Belle is le , ▁Sh am rock , ▁Er in , ▁Albert , ▁Bur go y ne , ▁Cy clo ps , ▁V ul can , ▁Jup iter ▁and ▁possibly ▁Jun o . ▁ ▁Some ▁of ▁these ▁were ▁either ▁built ▁or ▁re - built ▁to ▁the ▁ ▁gauge ▁that ▁was ▁adopted ▁around ▁ 1 8 5 6 . ▁ ▁A ▁small ▁number ▁of ▁these ▁engines ▁were ▁noted ▁as ▁still ▁operating ▁in ▁the ▁ 1 8 7 0 s ▁where ▁they ▁looked ▁dimin utive ▁compared ▁to ▁their ▁successor ▁ 2 - 2 - 2 WT ▁Neil son ▁locomot ives ▁introduced ▁from ▁ 1 8 6 5 . ▁ ▁Car ri ages