长钢轨精调
long rail track accurate adjustment
PG20型铺轨车
PG20 type track laying car
单悬臂式铺轨机
track-laying machine with single cantilever
高速铁路铺轨机组
high-speed railway tracklayer unit
架桥铺轨机
Bridge Building and Rail Laying Machine
铺轨架梁
Track - laying and bridge erection