I’m guessing that’s the same bus I used to take, it basically went from the corner where I used to live in Chengdu, by Babao Jie, to my destination in Mianyang. However, it is true that this particular bus is actually for the workers in the (Nuclear?) Research facility in Mianyang, which is their final stop. There’s some kind of science city there. Anyway, there was one day about ten years ago that someone complained about foreigners riding on a bus which contained briefcases filled with military secrets painstakingly stolen from foreign governments and from then on we were told that we weren’t allowed on that bus. So if it’s an April Fool’s Joke it’s nearing the record for the longest running April Fool’s Joke in China.