铁路工程用直发材料是指由路内外生产厂制造装车,不经工程局或铁路局的局级材料基地,直接运至工地堆料点或工地临近站的外来材料,主要有钢轨、道岔、钢梁等钢铁结构,钢筋砼枕、钢筋砼梁、钢筋砼电杆等钢筋砼制品,油(素)枕、桥岔枕、木电杆等直发材料,这些材 Straight hair material used for railway engineering refers to the external materials that are directly transported to the stacking site of the construction site or the site near the station without the bureau-level material base of the Engineering Bureau or the Railway Bureau by the manufacturing and loading of vehicles inside and outside the road. The main materials are rails, , Steel beams and other steel structures, reinforced concrete pillows, reinforced concrete beams, reinforced concrete poles and other reinforced concrete products, oil (prime) pillow, bridge sleepers, wooden poles and other straight hair material, these materials