H.P. - I think you’re right about the first van, MiniArt or Zvezda’s GAZ AA kit would do the job too. The other van looks similar to a 1927 Skoda 125 but I can’t find a match for those distinctive 3-slot vents aft of the radiator. Robert Jan thanks for the Schienenzeppelin photos – now there’s an engineer who skipped the lectures on Friction at college, with a v12 46 litre engine you could have flown more passengers further & probably faster – & I can’t help imagining the effect on those passengers waiting for the next train on the platform when the S-zep moved off….Thanks again Dave, those roofs were a bit fluked - er as you’d know that’s a model-maker’s technical term meaning to mess up initially & get lucky with the fix.
I know, I know, look what’s coming and I’m apologizing already, I didn’t want to see another tram for a long time either. But if I don’t go straight into the Trailer build now it’ll be 10 times harder to come back to it in a months’ time - like a bunch of blood-tests or root-canal appointments lurking ahead in the diary, it sure felt like that anyway when I opened the third MiniArt tram box last Monday. After a spine transplant it quickly became obvious that in order to scale the kit version down by approx. 33% I needed some accurate drawings, which didn’t exist apart from this one…

…which is moderately handy despite depicting a different (earlier) Driver alongside. So, using the 3 relevant “crime scene” images & 7 colour photos of Trailer 624 I nutted out the basic dimensions using a combination of relativity, estimation & The Force to start a basic 1/35-sized drawing…

…from which I could mark up usable kit parts for surgery…

It won’t always be a matter of slicing out one mid-section, sometimes to retain as much detail & end/edge locating points as possible twin sections either side of middle will need removing instead. In the above pic you can see the trailer’s smaller wheel-base compared to the kit’s side-plate openings. The big wheel’s from the kit for comparison - a free travel-pass for the first to identify the smaller wheel on the drawing (bonus points for manufacturer), re-purposed from the spares box as the closest match. At the top, the full kit floor laid out to show how much needs cutting out.
Step 1 – bogies, using T2’s assembly as reference. Cutting the inner rims…

Cross-hatching indicates required surgery…

Presto behold the incredible shrinking chassis…

The leaf-springs will wait until I’m sure of the connection points under the compartment body, meanwhile a check it fits the rails & the wheels spin…

So much for the easy part