Thanks to Bill Lane, for pointing out that this is a door and a half car,
and not X29 (actually M26b in B&O nomenclature).

So can anyone take me to class, number series and modelling advice for this
car?

to see the photo, click on the url below and enter 15152 in the keyword
search. You'll have to click the "click here for larger image" to see much.

http://www3.vpl.vancouver.bc.ca/spe/histphotos/photos-search.htm

Rob Kirkham