▁to ▁the ▁tur b ines ▁of ▁the ▁Electron ▁power house . ▁ ▁A ▁light ▁railway ▁line ▁was ▁built ▁on ▁top ▁of ▁the ▁fl ume ▁to ▁sh utt le ▁maintenance ▁workers ▁and ▁equipment . ▁It ▁is ▁known ▁as ▁" the ▁cro oked est ▁railway ▁in ▁the ▁world ," ▁but ▁it ▁is ▁not ▁the ▁only ▁railway ▁line ▁with ▁this ▁claim . ▁ ▁The ▁fl ume ▁and ▁the ▁railway ▁were ▁re built ▁in ▁the ▁ 1 9 4 0 s , ▁then ▁again ▁in ▁ 1 9 8 5 ▁on ▁the ▁original ▁track . ▁ ▁The ▁original ▁wood ▁frames ▁were ▁replaced ▁with ▁over ▁ 1 2 , 0 0 0 ▁steel ▁frames , ▁roughly ▁ ▁on ▁center . ▁ ▁The ▁fl ume ▁is ▁supported ▁with ▁over ▁ 6 , 0 0 0 ▁b ents . ▁ ▁The ▁fl ume ▁is ▁l ined ▁with ▁fir . ▁ ▁Electron ▁H ydro , ▁L LC ▁is ▁in ▁the ▁process ▁of ▁re building ▁the ▁wood ▁l iner ▁with ▁Al aska ▁yellow ▁ced ar ▁and ▁possibly ▁co ated ▁with ▁Poly ure a . ▁It ▁is ▁notable ▁for ▁likely ▁being ▁the ▁largest ▁fl ume ▁in ▁use ▁for ▁hydro elect ric ▁projects ▁in ▁the ▁United ▁States . ▁ ▁Fish ▁passage ▁facilities ▁ ▁The ▁up stream ▁migration ▁of ▁sp aw ning ▁adult ▁sal mon ▁and ▁rain bow ▁tr out ▁is ▁possible ▁by ▁a ▁concrete , ▁ ▁fish ▁lad der ▁built ▁alongside ▁the ▁wooden ▁di version ▁dam ▁opposite ▁the ▁fl ume ▁int ake . ▁M igr ating ▁ju ven ile ▁fish ▁that ▁in ad vert