Putanga 1: I runga ake i te awa ko te piriti tereina o Michigan Central kua kore e whakamahia ana ko te mea i mua i te piriti o Whirlpool Rapids i whakataetae mo te waka tereina me te Niagara Cantilever Bridge. Putanga 2: I runga ake ko te Michigan Central Railway Bridge i whakakorehia, i whakataetae ki tona mua, te Rapids Bridge whirlpool, me te Niagara Cantilever Bridge mo te waka tereina. Pātai: He ōrite te tikanga o te rerenga 1 me te rerenga 2? He Ae, he Kore rānei?
Āe, āe