The ventilation and air conditioning project in this phase is mainly composed of ventilation and air conditioning installation works in several single buildings; The specific individual buildings are as follows: underfloor wheel lathe shed, dangerous goods shed, guard room, test signal building, traction and step-down mixing station, car washing shed, garbage transfer station, main entrance guard room, air compressor room, battery room, special hangar and internal combustion engine shed, sewage treatment room, factory unwheeling repair shop, static commissioning