铁路建造和维护设备。道碴清理机。规范。
Railway track construction and maintenance plant. ballast cleaning machine. specifications.
铁路建造和维护设备。尖轨与辙叉的水准测量和布局维护。捣固和修整重型机械。
Railway track construction and maintenance plant. levelling and layout maintenance of points and crossing. tamping and trimming heavy mechanical.
这一产业和初期铁路的建造相伴而生。
The industry is coeval with the construction of the first railways.
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