R&LHS roster lists the 2250 (ex-400) retired in 1962 and the 2251 (ex-401) retired in 3/57. Both converted from NG to SG in 1949. Sorry, don't have info handy regarding which one was 458 and which one was 459. Neither is known to exist, though about three of the NdeM NG 2-8-0s converted to standard have survived on display.