O ituaiga oISCOR Uamea Uameae masani ona iloga i le mamafa. Mo se faʻataʻitaʻiga, o le 50 rail e masani ona tatou fai atu e faasino i le rail ma le mamafa o le 50kg/m, ma isi, e 38 rail, 43 rails, 50 rails, 60 rails, 75 rails, etc., ioe. E iai fo'i le 24-track ma le 18-track, ae o na almanac tuai uma. Faatasi ai ma i latou, o nofoaafi e 43 ala ma luga atu e masani ona taʻua o uila mamafa.