(1) site transportation: including engineering materials from the warehouse to the construction point of loading and unloading, transport and empty car backhaul.
(2) local projects: including road excavation, tunnel, channel construction.
(3) laying works: including laying, the middle of the first production, flip cover, buried, school tide, tractor production.
(4) both ends of the project: including support, suspension bridge and its base production and installation, terminal production, oil pressure and signal installation, the name of electrical performance testing.
(5) plug the project: including oil-filled cable plug head production, fuel tank, automatic drainage and signal installation.
(6) grounding works: including insulation joints, transposition boxes, protector, grounding box installation.