What is the difference between contract workers and regular workers in China Railway No. 12 Bureau?

Each engineering company of China Railway 12th Bureau is different. Taking the second company as an example, contract workers are divided into contract workers and temporary contract workers. Temporary contract workers are different from those in society. They used to be called peasant contract workers, and their wages are basically the same as those of their formal contract workers. The difference lies in the "five insurances and two funds", and the difference is huge: temporary contract workers only pay social pension insurance, Medical insurance (internal to the unit), and the base payment for the insurance is based on the average salary of employees in Taiyuan City, not based on your salary. Needless to say, that fund is definitely not "housing provident fund". Therefore, benefits are very discriminatory (you have to fight for them, they were not given to you at all before). Needless to say, temporary workers have low wages (the employment projects are customized) and nothing else. I hope this explanation is useful to everyone.