C750 TAXIING OUT FOR RWY 4R AT EWR CROSSED HOLD LINES FOR RWY 29 REQUIRING GAR.

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ON OCT/SAT/03 AT XA18; WE WERE CLRED TO TAXI TO RWY 4R AT EWR FROM GA AT THE N END OF THE FIELD. OUR INSTRUCTIONS WERE TO 'HOLD SHORT OF RWY 29 AT TXWY Q' WHICH MY FO ACKNOWLEDGED. I WAS TAXIING THE ACFT. WE PROCEEDED S ON TXWY Q. NEITHER MY FO NOR MYSELF SAW A RWY BOUNDARY SIGN ON THE GND (SOLID AND DASHED YELLOW HOLD SHORT LINE) NOR RWY HOLDING POS SIGN (RED BOARD WITH WHITE RWY NUMERALS). I WAS LOOKING FOR THE RWY HOLDING POS SIGN TO MARK MY HOLD POINT. SEEING NOTHING; I WAS UNDER THE IMPRESSION THAT RWY 29 WAS TXWY Z; WHICH INTERSECTS TXWY Q AT R ANGLES. I STOPPED 30-50 FT SHORT OF RWY 29 WHEN IT DID NOT LOOK RIGHT. GND CTL THEN TOLD US TO 'HOLD SHORT' WHICH MY FO ACKNOWLEDGED. I NOTICED TWR MADE A B757 ON FINAL TO RWY 29 GO AROUND. MY FO LOOKED BACK BUT DID NOT SEE ANY RWY HOLDING POS SIGNS. THE SUN WAS LOW AT ABOUT OUR 2 O'CLOCK POS; WHICH MADE IT DIFFICULT TO SEE TXWY Z AND THE RWY BOUNDARY AND HOLDING POS SIGNS; IF THERE HAD BEEN ANY. ALSO; A LARGE AIRPLANE WAS BEING TOWED IN FRONT OF US; WHICH COULD HAVE BRIEFLY OBSTRUCTED A RWY HOLDING POS SIGN.