As I understand it, under BR, steam locomotives built or owned by the GWR kept their original numbers, of which to my knowledge all were 4-digits. Additionaly:
ex-Southern stock had 30000 added (ie 30826),
ex-LMS stock had 40000 added to be numbered in the 4XXXX series (e.g. 46233) or 5XXXX (usually pre-grouping stuff such as ex-L&Y locos).
ex-LNER stock became 6XXXX
And BR designs were numbered from 70000 - 92250
Was the 10000 and 20000 series ever used for steam locomotives under BR? I know that the first LMS diesels were 10000 & 10001; was the rest of this series left empty for diesels then?
ex-Southern stock had 30000 added (ie 30826),
ex-LMS stock had 40000 added to be numbered in the 4XXXX series (e.g. 46233) or 5XXXX (usually pre-grouping stuff such as ex-L&Y locos).
ex-LNER stock became 6XXXX
And BR designs were numbered from 70000 - 92250
Was the 10000 and 20000 series ever used for steam locomotives under BR? I know that the first LMS diesels were 10000 & 10001; was the rest of this series left empty for diesels then?