长钢轨 long rail 超过标准长度的钢轨（其中包括厂焊钢轨）。
无缝线路长钢轨通常由铁路焊轨厂或现场焊轨基地焊接。
Long rails in jointless track are usually made on welded rail site or in railway welded rail factory.
所有的R 50 - R 65废旧长钢轨的化学成分都应完全符合ISRI标准的规定。
Chemical composition shall fully be ISRI compliant for all R50-R65 used long rails.
针对目前钢轨助推器设计上存在的不足，利用液压恒功率调速原理，设计了长钢轨液压助推器。
In view of the shortcomings in the design of rail Pushers, a hydraulic pusher for long rail was designed according to the principle of hydraulic constant power speed regulation.
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