But I would be glad to learn what happened to the bogies and how they did prove in practice:
Early in 1980, University of Bristol Railway Society paid a visit to Swindon BREL works premises, with East African Railways (EAR) 0-8-0 diesel switchers being completed, and lots of bulk-manufactured freight car bogies also for EAR's 1000 mm- gauge having been stored on the site.

Being basically to the three-piece bogie (tpb) design, these trucks featured self-centering rubber-cone suspension between the cast side beam "diamond" frames and the bolster. No coil springs, no vertical rubber blocks.

Amazingly, some secret was made about these bogies, but the bulk of these resting in the evening sun proved a fascinating view of its own, which is why I discreetly, albeit in a hurry, took the photo anyway. Hope it's still recognizable. The original slide is going to "redden" now beyond what I'd expect of a sunset scene ... apologies for the quality herewith, not helped by compressing the bmp image to below 1MB

Is there any information available on
1) better photos of a single such bogie, or the design drawings
2) the fate of these bogies
3) how they do / did work in EAR practice
4) patents applied (A1) or granted (B1/B2) for the design ?

I vaguely remember that a "Welsh subcontractor" (?) had supplied the trucks or parts of these, and that BREL Swindon had collected these on their site pending the settlement of "trouble" - though I do not remember which kind of "trouble" (Gloucester was allegedly to supply carbodies): Payment for/by EAR has always been critical, as I know from acquaintances at Kassel's Henschel works myself; there might have been the typical gauge mishap, in that the wheelsets might have wrongly featured 3'6" instead of EAR metre gauge, or the castings weren't right for some acceptance trials (an often- used "tool" in trade to conceal financial difficulties on the customer side, with the white-collar folks not losing face by blaming it all on the <censored> workmanship )

The tpb ("three-piece-bogie") design not by itself, but with such a bolster suspension appeared new to me then as now, and I have not seen it re-occur - although I would consider this a bold step to improve ride qualities of empty freight cars due to peculiar "progressive" characteristics of the rubber suspension. OTOH, I recently heard that termites very much liked rubber parts on newly-delivered rolling stock. Anyway, I see potential to introduce Scheffel-type cross-anchoring (self-steering) of wheelsets, and diagonal cross-bracing of side "diamond" frames to keep the entire bogie rectangular, without sacrificing its inherent torsional flexibility. Plenty of potential, it seems to me.

Anyone to tell me more of these interesting (for me, at least) bogies ?

TIA & kind regards

CTW, DE-Goslar