R ▁numbers ▁were ▁ 1 1 - 2 0 ▁and ▁ 3 1 - 3 5 . ▁ ▁The ▁Southern ▁Railway , ▁which ▁acquired ▁the ▁locomot ives ▁in ▁ 1 9 2 3 , ▁initially ▁number ed ▁them ▁B 1 1 - B 2 0 , ▁B 3 1 - 3 5 ▁and ▁later ▁ 2 0 1 1 - 2 0 2 0 , ▁ 2 0 3 1 - 2 0 3 5 . ▁ ▁With draw al ▁ ▁All ▁the ▁I 2 ▁were ▁with dra wn ▁between ▁ 1 9 3 3 ▁and ▁ 1 9 3 9 ▁but ▁two ▁locomot ives , ▁numbers ▁ 2 0 1 3 ▁and ▁ 2 0 1 9 , ▁saw ▁further ▁service ▁on ▁the ▁Long mo or ▁Military ▁Railway ▁where ▁they ▁surv ived ▁until ▁at ▁least ▁ 1 9 4 7 . ▁ ▁At ▁Long mo or , ▁they ▁were ▁number ed ▁ 2 4 0 0 ▁and ▁ 2 4 0 1 ▁respectively . ▁ ▁These ▁numbers ▁were ▁later ▁changed ▁to ▁ 7 2 4 0 0 ▁and ▁ 7 2 4 0 1 . ▁ ▁None ▁of ▁the ▁class ▁has ▁been ▁preserved . ▁The ▁I 4 ▁class ▁were ▁with dra wn ▁between ▁ 1 9 3 6 ▁and ▁ 1 9 4 0 . ▁No ▁examples ▁of ▁either ▁class ▁have ▁been ▁preserved . ▁ ▁Lo comot ive ▁Sum mary ▁ ▁S ources ▁▁▁▁▁ ▁page ▁ 2 7 1 , ▁ ▁External ▁links ▁ ▁Marsh ▁I 2 ▁Class ▁ 4 - 4