There are a lot of questions with any business, and when you are dealing with making things in China the questions seem to get more complicated. For example, China is trying to move their country more upscale into high end products rather than just low cost assembly for companies outside the country, and that could make it more difficult to make trains there, finding labor if there is competition from better paying industries, might leave this kind of work to be honest with fly by night piecemeal operators who may not be the most stable of operators. It already is difficult dealing with contracted out manufacturing, SLA's mean pretty much nothing and you can only hope the people on the other end are operating in good faith, and they run into problems with secondary suppliers (hardware, circuit boards, etc). China right now in many ways is in flux, things are changing (leaving out the whole trade/political situation which isn't really relevant here), and it is going to be reflected in the model the various train manufacturers are using. The thing is, I don't know of another model that is going to work, if China gets too expensive then I suspect you might see trains made in Vietnam or Malaysia or perhaps Africa if low wage production is what they want, or potentially maybe Chinese companies working in Mexico, it already is happening).
