FLC FORGOT TO RELEASE THE PROP BRAKE ON 1 ENG AND TAXIED INTO POS FOR TKOF. UPON TKOF CLRNC NOTICED THAT THERE WAS NO ENG TORQUE OR AC GENERATOR 'ON LINE' OR ENG TORQUE INDICATION.

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TAXI OUT TO RWY WITH PROP BRAKE ON; DID NOT NOTICE UNTIL CLRED FOR TKOF. STARTED ENGS AS NORMAL BUT SOMEHOW MISSED THROWING PROP BRAKE SWITCH TO OFF DURING THE START ENG FLOW. WHEN ITEM WAS COVERED ON THE CHKLIST; I CHKED THE POS OF THE SWITCH AND IT LOOKED RIGHT. HOWEVER; ON OUR MIXED FLEET OF ATR 42 ACFT THE POS FOR ON AND OFF (IE: UP BEING ON AND OFF BEING DOWN) IS REVERSED. EVEN THOUGH IT IS LABELED; IT JUST LOOKED CORRECT AND I MISSED IT. TAXI OUT SEEMED NORMAL DUE TO PWR STEERING. WHEN CLRED FOR TKOF WE NOTICED THE ACW GENERATOR WAS NOT ON LINE AND TORQUE WAS NOT REGISTERING; AT THIS POINT WE REALIZED WHAT HAD HAPPENED. WE INFORMED THE TWR THAT WE NEEDED TO TAXI OFF THE RWY FOR A PRECAUTIONARY CHK. AFTER CLRING; WE GOT THE PROP TURNING; DID THE APPROPRIATE CHKLISTS OVER AND THEN PROCEEDED AS NORMAL. LESSON LEARNED: CHK THE SWITCH THEN CHK THE GAUGES! THAT GOES FOR ME AS WELL AS FO. AS A BACK UP: IT WOULD BE NICE IF THE CONFIGN WARNING INCLUDED AN ALARM WHENEVER CONDITION LEVER IS ADVANCED WITH PROP BRAKE ENGAGED.