4 9 ▁demonstrated ▁the ▁potential ▁of ▁working ▁the ▁line ▁by ▁conventional ▁locomot ives . ▁ ▁The ▁final ▁atmos pher ic ▁train ▁ran ▁on ▁ 1 2 ▁April ▁ 1 8 5 4 ▁when ▁the ▁D & K R ▁handed ▁the ▁line ▁to ▁the ▁D & WR ▁as ▁part ▁of ▁a ▁ 1 8 4 6 ▁agreement ▁for ▁the ▁D & K R ▁to ▁le ase ▁their ▁line . ▁ ▁The ▁D & WR , ▁who ▁began ▁running ▁services ▁from ▁B ray ▁to ▁Dal key ▁and ▁Dublin ▁Har court ▁Street ▁on ▁ 1 0 ▁July ▁ 1 8 5 4 ▁then ▁re built ▁the ▁Dal key ▁King st own ▁section ▁to ▁, ▁removing ▁the ▁height ▁restriction , ▁and ▁re - open ing ▁in ▁October ▁ 1 8 5 5 . ▁ ▁July ▁ 1 8 5 6 ▁oper ational ▁hand over ▁The ▁D & K R ▁le ase ▁to ▁the ▁D & WR ▁came ▁into ▁operation ▁on ▁ 1 ▁July ▁ 1 8 5 6 , ▁with ▁the ▁D & K R ▁receiving ▁compens ation ▁for ▁all ▁oper ational ▁equipment . ▁ ▁Some ▁engines ▁had ▁already ▁been ▁converted ▁to ▁, ▁and ▁the ▁D & WR ▁proceeded ▁to ▁convert ▁the ▁whole ▁line ▁from ▁ ▁to ▁the ▁ ▁compatible ▁with ▁the ▁rest ▁of ▁the ▁D & WR . ▁ ▁Track ▁gauge ▁conversion ▁was ▁done ▁in ▁ 1 8 5 7 ▁at ▁a ▁cost ▁of ▁£ 3 8 , 0 0 0 . ▁ ▁After math ▁Con version ▁to ▁ ▁enabled ▁the ▁D & K R ▁to