This are the results of western countries of their outsourcing to save costs and now they got a lesson that was a major mistake to do so and that dictatorship countries never reliable or safe. They can change their laws on a daily base and with a mindset of criminals and thieves.
DB uses trains from Siemens and all parts who are from China are from branches from Siemens in China or from their cooperations but anything developed under Siemens. Try again and first work a few years in a Chinese company who is in this fields and learn who engineered or developped what. But sure for not so complicate parts Chinese are stealing and copy things if that is for you a sign for engineering then I understand your believings. China is still listed as a development country and is not listed in ranking of developed countries. By the way believing is not the same like knowing and there are many who work in that fields ir software developper or IT experts who also know what I am talking about because they have to work with it. But for sure I am not a big fan that we transfered too much tech to China and build up their productions their evil mindset the world can see now.