Too quick to blame CAF. They have built to a specification provided from ANO in the UK, probably at a spec and cost to save money.
The tender invite will provide an outline of requirements (likely to include bits not falling off) it will be down to the manufacturer to design something that meets the spec.
You could design something then get the constructor to build it exactly to your spec. But then any design issue is on you. This is how I build my extension. I did the drawings, plans specced out the materials and things like the location of the lights and sockets. But even then I let the builder who built to this design have some freedom as to exactly where he put the cable runs etc.
I'm not sure if any train builders would build a train completely to a builders design and spec. And if they did it would be at a crazy price. Most trains are built on an existing platform reusing standard or existing parts methods jigs and dies.
I wonder if any other of CAF stock (foreign) is built using this T rail construction and with yaw dampers hung in teh same way.
I also wonder if the other equipment fixed to these rails is affected or if it is just the way in which the force is applied to this bracket which appears to add leverage is the issue.