here is some useful infomation on the numbering of LMS wagon D-plates. if your listing a LMS D-plate this list should tell you what companies wagon the plate came off.
as im sure you are aware the LMS was formed in 1923 out of several independent companies and the newly formed LMS inherited all these companies rolling stock.
when it came to wagons the LMS set about renumbering and classifing them into its own scheme - to keep closer tabs on them and to comply with RCH/government standards of unfiforming grade of wagons.
a lot of people wonder what type of wagon their plate came off, this is relitively easy to research for BR and privately built vehicle but details from the big four companies 1923 - 1948 is not so readily available.
after 1923 most wagons for the LMS where built by themselves at Wolverton, Crewe, Bromsgrove, Horwich, Derby, Patricroft, Dukenfield etc and others farmed out to private builders such as Headwrightson, Hurst Nelson and such like. these as a rule (but not strictly true)these came under the numbers 357000 + upwards and has the word STANDARD on them aswell as the weight.
if you have an LMS plate with a lower number, here is a list of the absorbed companies wagon taken on by the LMS................
ex MIDLAND Rly 1 - 129000
ex L&Y 130000 - 169999
ex Glasgow & S/Western 170000 - 191999
ex North Staffs Rly 192000 - 199999
ex LNWR 200000 - 278999
service vehicle 279000 - 279999
brake van 280000 - 281999
horse box & others 282000 - 284999
ex FURNESS Rly 285000 - 291999
ex Highland Rly 292000 - 299999
ex Caledonian Rly 300000 - 352999
Cal rly + others sevice vehicles 353000 - 356999
i hope this guide helps you with some info on your D-plates