Ukara 1: Upstream yaiku Bridge Railway Central Michigan sing ora digunakake, sing sadurunge, Jembatan Cantilever Niagara, saingan karo whirlpool Rapids Bridge kanggo transportasi rel. Ukara 2: Upstream yaiku Bridge Railway Central Michigan sing ora dioperasikake, sing saingan karo pendahulune, Rapids Bridge whirlpool, karo Niagara Cantilever Bridge kanggo lalu lintas sepur. Pitakonan: Apa ukara 1 lan ukara 2 padha tegesé? Ya utawa Ora?
Ora