Khi daim hlau, tseem hu ua lub hauv paus phiaj los yog cov phiaj yas, yog ib qho ntawm cov tseem ceeb tshaj plaws hauv kev tsheb nqaj hlau.Lawv hu ua khi khi vim tias lawv "khi" txoj kev tsheb ciav hlau rau cov tsheb ciav hlau ties (sleepers)Cov. Ntsia nruab nrab ntawm cov hlau txuas thiab cov ciav hlau ciav hlau, khi cov paib ua haujlwm ruaj khov uas txuas rau txoj kev tsheb ciav hlau mus khi. Lawv lub luag haujlwm tseem ceeb yog faib cov tsheb ciav hlau hnyav dhau ntawm tus neeg pw tsaug zog, txo cov kev coj hnav, thiab tiv thaiv kev sib tw los txiav rau hauv txoj hlua khi.
Ib lub phaj khi (tseem hu ua cov phaj pib lossis tsuas yog lub phaj steel) yog cov phaj steel nruab nrab ntawm txoj kev tsheb nqaj hlau thiab khi qhob. Nws lub ntsiab yog:
Faib Load- Nws kis lub nra ntawm tus ciav hlau hla ntawm thaj chaw loj dua ntawm txoj hlua khi, txo kev hnav.
Nco ntsoov- Lub phaj khi muaj lub rooj zaum thiab lub xub pwg nyom uas pab tuav txoj kev tsheb nqaj hlau kom yog.
Txo qis txav- Nws tso cov tsheb ciav hlau thiab txo cov txiav lossis puas ntawm txoj hlua khi.
Txhim Kho- Qhov nyob rau hauv daim di khi tso cai spikes, screws, lossis bolts kom dhau los, kom muaj zog nrawm nrawm ntawm kev tsheb ciav hlau thiab khi.
Gnee Rail cov khoom siv siab - Cov khoom ua tau zoo, suav nrog kev tsheb ciav hlau yooj yim, clims bolts, ntsia ntsia hlau spikes,aub spikes, roj hmab cov ntaub qhwv, thiab crane sib dhos clips thiab peb kuj muab cov kev daws teeb meem customized, thiab tom qab muag kev muag khoom kom tau raws li cov kev xav tau ntawm txoj haujlwm thoob ntiaj teb.