It's kinda sad that stuff like Caltrain electrification, for example, has a huge and well-researched article despite not even being in service yet, just because of the large amount of Wikipedians in the Bay Area where the Wikimedia Foundation is headquartered. In the meanwhile, entire operational train systems both in China and elsewhere in the world that have vastly greater ridership, longer length, more advanced technology, etc, get nary a mention. I have nothing against Caltrain electrification getting a great article since I'm an inclusionist but it is just sad how little of the cool things, especially in China, are on Wikipedia.
Chinese topics are usually well-covered on the Chinese Wikipedia, the lack of an English-language article is more likely to be attributable to a shortage of English-Chinese bilinguals translating that information.
Do you have some particular train system in mind?
Outside of the chinanet this also happens, where Google, Apple, Facebook and Microsoft all try to keep you inside their ecosystems (to say nothing of the traditional media companies like Disney, WBD etc), but outside the chinanet there remains a small but influential "information wants to be free" movement that is unaligned with any government or corporation. So we have Wikipedia and OpenStreetMap and the Internet Archive... It's not much, but it's something.
From my perspective if people really want to see a free and open internet, where information is never hidden in gated communities, the only choice is to support non-profits with aligned missions. Then people all over the world - including China - can contribute.