Salary 1500 yuan. The 3000 you said at the job fair depends on the efficiency of your project department. If the efficiency is good, there may be so many, but if it is not good, 1500 can still be guaranteed.
The tunnel is fine. I have some friends who work in Hangzhou, but not in the tunnel. Their salary is about 6000 now. It is also from several other bureaus of China Railway.