i've got to make it to Japan soon. San Salvador is a disappointment currently although changing rapidly. walking through some neighborhoods is beautiful and there are new bike lanes i noticed last time i was there. San Salvador has a natural east west corridor that could benefit from a metro to connect eastward bus station with westward bus station. i'm not sure what the soil is like as far as tunneling. light rail would also be a step up from the buses. i do worry if people there get richer, they will just go for cars and more congestion... but maybe bitcoin fixes it. Mass transit definitely scales and saves money for long-time preference society.