Cov Nta Ntawm Arema Txheem Hlau Rail

The models of American standard rails are divided into four types: 85, 90, 115, 136. These four models are mainly used in railways in the United States and South America. Qhov kev thov hauv Tebchaws Meskas thiab Asmeskas South America yog dav heev.
Nta ntawm ntsia hlau:
Cov qauv yooj yim uas tsis muaj kev txi ua tau zoo
Haib heev
Ntsia tau txais kev pabcuam ntev ntev
Ntau yam ntawm cov ntawv thov
Txawm li cas los xij, nws yuav tsum tau sau tseg tias American txheem kev tsheb nqaj hlau muaj lub hauv qab nqaim thiab yog yooj yim deformed. Yog li ntawd, cov neeg hauv Tebchaws Meskas thiab South America feem ntau yog siv hauv subways thiab tsheb ciav hlau.