This has nothing to do with cars at all but on reading about railroad trucks in a train magazine I was amazed to find they have absolutely no fasteners at all in them.
Anybody who has seen on of those 100 car US trains will have watched dozens of the two axle trucks ( bogies) go by. each one carries up to 70 tons of load but they have no fasteners at al in the despite having both springs and friction dampers. As explained in the patent detail l below they have just five parts,some friction blocks and springs. One cross bolster with pin and pads, two side frames and two wheelsets with the bearings forced on. You buy the bits separately and assemble the whole thing with a fork lift truck and some crowbars. First hold up the bolster , then loosely slip the side frames on. Then slip the necessary coil springs in while it is under no load, using a crowbar to pop them in. Then use a forklift to lift and drop the assembly onto the two wheel sets.
All that weight plus a suspension/damper system but no fasteners!
Edited by mariner, 23 September 2018 - 11:17.