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, ko te mea i mua i a ia, ko te Niagara Cantilever Bridge, i whakataetae ki te Rapids Bridge whirlpool mo te kawe tereina. Pātai: He ōrite te tikanga o te rerenga 1 me te rerenga 2? He Ae, he Kore rānei?
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