I'm old enough to remember when the 158s when new had cracking of the similar yaw damper bracket and had to return to works for a much more substantial one to be fitted.
Pic attached of a 158 bogie
Note the replacement bracket (the one with the hole in) extends up the body side and looks to be welded or bonded to the side.
How or if you can weld steel to aluminium I know not.
K
Other way round IIRC. CAF did the bodies, Siemens did the running gear.
Was the ride quality of the 158 significantly worse before that work was done? I'd assume not, but if it was then perhaps we can be hopeful that whatever modifications have to be made to the 195s will make them less rough
The bodies of the 158s were the first large scale use of extruded aluminium planks and as a result there was still quite a lot of learning involved.
The welds holding the yaw damper bracket to the body cracked due to the number and amplitude of the stress reversals as the bogie rotated about its vertical centre when running at speed. Although there had been some use of hydraulic yaw dampers previously most bogies until that date either did not have to use them because the trains' speeds were not high enough or used a disc of friction material around the centre pivot. Earlier stock tended to have steel bodies. The modified brackets in the 158s spread the stresses over a wider area.
There was no difference in the ride quality in the 158 after the modification - in both cases the bracket did its job except that the lifetime of the welds in the unmodified form was too short!
The other early snag with the 158s was cracking in the top corners of the door openings. Again a retrospective modification programme was needed.
I'm asking because I don't know - do any of the CAF products in other countries spend much of their time running at more than 75mph or thereabouts? The stresses get significant as the forces on the bogies increase and it may be that CAF's experience in this area is limited.
But, my word, other stock has had problems as well which caused withdrawal from service.
After some 120 years of experience the driving wheels and axles on BR's Britannia class steam locomotives went round at different speeds which caused some anguish and they were grounded until the problem was sorted out. Some early ac electric multiple units also had problems as did some classes of diesel-hydraulics. Twas ever thus...