CHECK AIRMAN AND NEW FIRST OFFICER ABOARD CARJ EXPERIENCE RUNAWAY STAB TRIM. FOLLOW CHECKLIST AND RETURN TO DEP ARPT FOR SAFE LANDING.

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I WAS FLYING THE CRJ AS AN FO UNDERGOING LAST DAY OF LINE TRAINING. THE CAPT WAS A CHK AIRMAN. WE DEPARTED RWY 12L IN MSP; TURNED L ON A HDG ASSIGNMENT; AND CLBED THROUGH 1000 FT. WE RETRACTED FLAPS PER THE SCHEDULE AND LEVELED ON AN APPROPRIATE HDG OF 070 DEGS. AIRSPD WAS ACCELERATING THROUGH 200 KTS; I SELECTED 250 KTS ON THE SPD BUG (AUTOPLT ON) AND WITHIN SECONDS; AS THE PITCH WAS DECREASING; THE AUDIBLE CLACKER SOUNDED. I DID NOT IMMEDIATELY IDENT THE CAUSE; BUT THE CAPT RECOGNIZED IT AS A STABILIZER TRIM RUNAWAY. HE DISCONNECTED THE AUTOPLT (OR IT CLICKED OFF BY ITSELF -- NOT SURE) AND PUSHED THE STABILIZER TRIM DISCONNECT SWITCH. WE BOTH PUSHED FORWARD; AND THEN I MAINTAINED CTL; PUSHING FORWARD AGAINST A NOSE-UP FORCE. FORCE REQUIRED WAS FIRM BUT NOT EXCESSIVE. THE STABILIZER TRIM INDICATOR READ 6.0 AT TIME OF DISCONNECT. THE CAPT BEGAN THE NON-NORMAL CHKLIST. WE TRADED ACFT CTL WHERE CALLED FOR; AND I DISCONNECTED CIRCUIT BREAKERS FOR STABILIZER CH1 AND CH2 HSTCU AS DIRECTED BY THE PROC. THESE HAD TO BE PERFORMED BY THE FO; DUE TO THE CIRCUIT BREAKER LOCATION. WE COMPLETED THE CHKLIST; AND PREPARED FOR A RETURN TO MSP AS DIRECTED; LNDG FLAPS 20 DEGS ON RWY 12R. WX; RWY LENGTH; AND BRAKING CONDITIONS WERE EXCELLENT FOR THIS APCH. UPON RETURN TO GATE; THE TECHNICIANS WERE UNABLE TO DETERMINE THE FAULT CODES; DUE TO OUR PULLING THE NOTED CIRCUIT BREAKERS AS DIRECTED.