RWY INCURSION DURING A NIGHT OP IN THE RAIN BY THE PIC OF A CESSNA CITATION 1 AT MTN; MD.

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I WAS CLRED TO TAXI TO RWY 33. ACCORDING TO GOV APCH PLATES ARPT DIAGRAM; I WAS ON THE MAIN RAMP AND STARTED TAXIING TOWARD THE RWY; LOOKING FOR TXWY K (A 135 DEG R TURN) TO PUT ME ON TXWY F. THE IDENT ON THE ARPT DIAGRAM FOR TXWY K BLOCKED THE VIEW FOR TXWY F CONTINUING ALL THE WAY TO THE RAMP. I WAS TAXIING ON THE TAXI LINES IN THE PAVEMENT LOOKING FOR MY HARD R TURN. I SAW IT AND STARTED TOWARDS IT WHEN I REALIZED THAT MY NOSE CROSSED OVER THE RWY HOLD SHORT LINE. AT THE TIME; A HUGE TSTM PASSED THROUGH MINS EARLIER AND IT WAS STILL RAINING. THE HOLD SHORT LINES WERE NOT EASY TO SEE AND I THOUGHT I HAD CONSIDERABLE DISTANCE STILL FROM THE RWY; AND WAS ABOUT TO MAKE MY R TURN ONTO TXWY. ADDITIONAL SIGNAGE NEEDS TO BE ON THIS LARGE RAMP GIVING HEADS UP; RWY NEAR OR SOMETHING TO PREVENT OTHERS FROM REPEATING THIS; ESPECIALLY WHEN THE TWR IS CLOSED. THE TWR DID THEIR JOB BY TELLING ME TO STOP WHEN THEY SAW I WAS ABOUT TO CROSS THE HOLD SHORT LINE. POOR VISIBILITY; AND MY INTERP OF WHAT TO LOOK FOR; CAUSED ME TO MISS THE ORIGINAL R TURN ONTO TXWY F AND LOOK ONLY FOR TXWY K. LESSON LEARNED.