Two things, if I may.
Firstly, referring back to my post about the Holyhead photo and the truck having fixed sides. Jon's model also looks to have fixed sides and I know that end-loading was common, but the Holyhead photo shows no end loading, so how did they load and unload that car? Around the time of the photo the LNWR were (belatedly) changing to hinged sides on new OCTs.
Secondly, am I alone in despairing at the lack of detail from the NRM? This photo is an example. They are supposed to be the expert, the national point of reference and centre of excellence, yet captions like this one are bland and uninformed. I could write a page about that picture but all they tell us is what's on the negative list and that the car is loaded onto an open wagon, which it isn't - its a CARRIAGE truck. Nothing there about the railway vehicles, the car (they could look up the registration number), the lettered railway laundry baskets, the cranes, the roof construction, no facts and dates about the building. Nothing a ten year old couldn't have written.
Rant over, time for a tea break! Yes, moderate this if you wish!
Mike