Which department of the railway completes the line maintenance?

Ministry of public works. Baidu Library shows that the public works department is the basic department of the railway and is mainly responsible for line maintenance and repair. The main duties of the Public Works Department are: to be responsible for the formulation of government engineering technical standards, the research of project requirements and positioning, the technical decision-making of planning and construction, the organization of design review, and the implementation of design effects in the coordination stage of project construction. For example, line maintenance, such as rail, sleeper, ballast, ballast bed, fence network, railway surrounding environment, etc.