Narrative:

Cleared to taxi to runway 23 from ramp via taxiway J. Crossed both runways 15L/right and proceeded on. Saw runway 23 CAT 1 sign, but not the lines painted on taxiway. The captain and I thought it was the ILS hold short line, but with VMC conditions moved up to just short of the runway. Upon contacting toronto tower, were advised that we had encroached over the runway 23 hold short line 'a couple hundred ft back.' they said it wasn't a big deal and that an official report was not necessary. The captain and I decided to fill out a NASA report regardless.

Google
 

Original NASA ASRS Text

Title: CARGO LGT FLC UNKNOWINGLY PASSED THE RWY HOLD SHORT LINE, BUT HELD SHORT OF RWY.

Narrative: CLRED TO TAXI TO RWY 23 FROM RAMP VIA TXWY J. CROSSED BOTH RWYS 15L/R AND PROCEEDED ON. SAW RWY 23 CAT 1 SIGN, BUT NOT THE LINES PAINTED ON TXWY. THE CAPT AND I THOUGHT IT WAS THE ILS HOLD SHORT LINE, BUT WITH VMC CONDITIONS MOVED UP TO JUST SHORT OF THE RWY. UPON CONTACTING TORONTO TWR, WERE ADVISED THAT WE HAD ENCROACHED OVER THE RWY 23 HOLD SHORT LINE 'A COUPLE HUNDRED FT BACK.' THEY SAID IT WASN'T A BIG DEAL AND THAT AN OFFICIAL RPT WAS NOT NECESSARY. THE CAPT AND I DECIDED TO FILL OUT A NASA RPT REGARDLESS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.