> If you go to Seoul they don't even have Romanized names for the train stations. Everything's in Hangul. For a massive system built primarily for Japanese speakers it's really pretty accessible.

I'm not sure when you were last in Seoul, but this was not the case when I was there recently. Perhaps they worked on it for the Olympics? Most signs (and I think every navigational sign) I saw in the metro stations was quadrilingual - Hangul, English, Chinese, and Japanese. The station names themselves were written in Hangul and English (not sure about Japanese/Chinese characters). I tried to find any news articles or background about this but I couldn't.

I have much more difficulty navigating the metro in Tokyo than I did in Seoul, and I can read a good bit of Japanese and no Korean.