Baakad, weel magaca Ingiriisiga.Waa qalab ka kooban oo qaadi kara baakad ama baakad si loogu raro, waana mid ku habboon rarista iyo dejinta qalabka makaanikada.

Guusha weelku waxa ay ku jirtaa jaan-goynta badeecadeeda iyo guud ahaan nidaamka gaadiidka ee laga aasaasay.Waxay jaangoyn kartaa behemoth-ka culeyska daraasiin tan ah, waxayna si tartiib tartiib ah u xaqiijin kartaa nidaamka saadka ee taageeraya maraakiibta, dekedaha, waddooyinka, waddooyinka waaweyn, saldhigyada kala wareejinta, buundooyinka, tunnelyada, iyo gaadiidka kala duwan ee adduunka oo dhan.Tani runtii waa mid mudan.Mid ka mid ah mucjisooyinkii ugu waaweynaa ee abid bani'aadamku abuuray.

Cutubka xisaabinta weelasha, soo gaabinta: TEU, waa soo gaabinta Ingiriisiga Labaatanka Equivalent Unit, oo sidoo kale loo yaqaan unugga beddelka 20-foot, oo ah qaybta beddelka ee xisaabinta tirada weelasha.Sidoo kale loo yaqaan International Standard Box Unit.Inta badan waxaa loo adeegsadaa in lagu qeexo awoodda markab uu ku raro weelasha, sidoo kale waa qeyb muhiim ah oo tirakoobka iyo beddelka ah ee konteenarka iyo dekedda.

Inta badan gaadiidka konteenarada ee wadamo kala duwan ayaa isticmaala laba nooc oo weel oo dhererkoodu yahay 20 cagood iyo 40 cagood.Si loo mideeyo xisaabinta tirada weelasha, weelka 20-fiit waxa loo isticmaalaa hal unug xisaabeed, iyo weelka 40-foot ah waxa loo isticmaalaa sidii laba unug xisaabeed si ay u fududayso xisaabinta midaysan ee mugga hawlgalka weelka.

Eray la isticmaalo marka la tirinayo tirada weelasha: sanduuq dabiici ah, oo sidoo kale loo yaqaan "sanduuqa jireed".Sanduuqa dabiiciga ahi waa sanduuq jireed oo aan la beddelin, taas oo ah, haddii ay tahay weel 40 cagood ah, weel 30 cagood ah, weel 20 cagood ah ama weel 10 cagood ah, waxa loo tiriyaa hal weel.