Iityhubhu zentsimbi ezingenamthungo zeebhoyila eziphantsi neziphakathi (GB3087-2018) ziityhubhu zentsimbi engenamthungo zekhabhoni ezikumgangatho ophezulu eziqengqelekayo nezitsalwa ngokubandayo (eziqengqelekayo), ezisetyenziselwa ukwenza iipayipi zomphunga ezishushu kakhulu, iipayipi zamanzi abilayo zezakhiwo ezahlukeneyo zeebhoyila ezinoxinzelelo oluphantsi noluphakathi kunye neepayipi zomphunga ezishushu kakhulu, iipayipi ezinkulu zomphunga, iipayipi ezincinci zomphunga kunye neepayipi zezitena ze-arch zeebhoyila zelocomotive.

Iziphelo zombhobho wentsimbi mazibe zithe nkqo kwi-axis yombhobho wentsimbi, kwaye kufuneka kususwe ii-burrs.GB3087Umbhobho wentsimbi oqhelekileyo wenziwe ngentsimbi yesakhiwo yekhabhoni ekumgangatho ophezulu, eqengqelekayo okanye ebandayo, edla ngokufunauxinzelelo lwamanzie, ukugoba, ukuvutha, ukucandakunye nezinye iimvavanyo ukuqinisekisa umgangatho kunye nokusebenza kwemveliso.