Tryng to make this a quickie I have taken a leaf out of Matt's book and have been trying to build in bulk. To that end I have spent some time each day working on the bogies for the coaches and for the two wagons that fell into my shopping cart at the same time.
The bogies are very straightforward. First there is the matter of cleaning off the flash, of which there is a reasonable amount. Once done it was a case of adding the brake blocks, slightly tedious to have to glue 24 of the same thing but you get into a rhythm.
The next phase is to organise couplings. I use Greenwich couplings and these can be easily fitted by cutting and filing a groove in the top of the bogie (one has a very fetching matching groove in the underside. Don't ask!). Once done, I file off the paint from the underside tail of the coupling and then superglue them in. I usually do build Greenwich coupling in bulk and discovered that I did not have a sufficient supply for this project so there was a temporary diversion when I spent spare time on Christmas Day folding and building the couplings. Now that is definitely an item best built in bulk!
Lastly, the brake assembly needs putting together. Here I fought the tempation to 'improve' it and lost. The pillar is fine and was glued on as is but the shaft on the brake wheel is just too long and the plastic shaft too fragile. I replaced the shaft with some brass wire. I also drilled out the handwheel to take the wire. They were superglued together and, once dry, I cut away some of the brake wheel shaft. This assembly was then glued to the pillar. It's definitely better to have less of a blob under the wheel but some of them are not as level as they should be.
After that it was a case of painting. I elected to hand paint so I didn't get paint in the axle boxes nor the rubbing plate but that meant tediously painting them first with primer (Humbrol Number 1). This struggled in a couple of palces to stick and I realised I had not washed the parts to remove any moulding remover but it wasn't too bad so I persevered. The topcoat was with a Games Workshop "Base Corvus Black". This is a good contenter for a colour that isn't too black but neither is it obviously grey. Again, this was tedious to put on.
Here they are, a collection of bogies sat on the diorama, just!