▁the ▁North ▁American ▁railway ▁grid . ▁ ▁Like ▁the ▁other ▁vessels ▁in ▁the ▁" Rad ium ▁Line ", ▁she ▁was ▁re ass emble d ▁in ▁Water ways , ▁on ▁the ▁Clear water ▁River , ▁a ▁trib ut ary ▁of ▁the ▁Mack en zie , ▁and ▁then ▁proceeded ▁up ▁the ▁S lave ▁River ▁to ▁Fort ▁Smith , ▁and ▁port aged ▁to ▁the ▁upper ▁river , ▁where ▁she ▁could ▁navigate ▁most ▁of ▁the ▁remainder ▁of ▁the ▁extensive ▁Mack en zie ▁River ▁system . ▁ ▁In ▁ 1 9 3 8 ▁the ▁S ask ato on ▁Star - P ho enix ▁reported ▁the ▁vessel ▁was ▁designed ▁to ▁travel ▁at ▁up ▁to ▁ 2 0 ▁kn ots , ▁faster ▁than ▁the ▁Rad ium ▁Line ' s ▁larger ▁vessels , ▁so ▁it ▁could ▁take ▁over ▁to ws ▁in ▁regions ▁of ▁particularly ▁rapid ▁current . ▁The ▁Canadian ▁Transport ation ▁Agency ▁reported ▁her ▁speed ▁as ▁ 9 ▁kn ots ▁in ▁ 2 0 1 1 . ▁ ▁On ▁November ▁ 1 6 , ▁ 1 9 4 5 , ▁the ▁Rad ium ▁Express ▁and ▁the ▁Rad ium ▁King ▁were ▁caught ▁by ▁free ze ▁up ▁in ▁Y ellow kn ife . ▁ ▁In ▁ 2 0 0 5 ▁At omic ▁Energy ▁of ▁Canada ▁published ▁a ▁study ▁of ▁the ▁to xic ▁legacy ▁of ▁the ▁min ing ▁of ▁radio active ▁ore ▁at ▁Port ▁Rad ium . ▁ ▁According ▁to ▁the ▁report ▁the ▁Rad ium ▁Express ▁and ▁all ▁the ▁other ▁surv iving ▁vessels ▁of ▁the ▁Rad ium ▁line ▁were ▁found ▁to ▁be ▁free ▁of