E145 FLT CREW CROSSED RWY 31 HOLD LINE TAXIING FOR DEP AT MDT; PA.

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I AM FILING THIS RPT BECAUSE I INADVERTENTLY CROSSED A HOLD LINE WITHOUT A CLRNC. HAVING RECEIVED CLRNC TO TAXI TO RWY 31 IN HARRISBURG; PA (MDT) VIA TXWY A; THE FO AND I COMPLETED OUR BEFORE TKOF FLOWS AND CHKLISTS DURING TAXI. SEVERAL HUNDRED FT BEFORE THE RWY; BELIEVING THE HOLD LINE WAS STILL IN FRONT OF US; WE RADIOED THE TWR WE WERE READY FOR TKOF. AT THIS TIME; THE TWR CTLR TOLD US TO HOLD OUR POS AND THAT THE HOLD LINE WAS BEHIND US. UPON ARRIVING AT OUR DEST; I CALLED THE MDT TWR CTLR. THE TWR CTLR SAID THAT THE PLACEMENT OF THE HOLD LINE HAS CREATED SUBSTANTIAL AND ON-GOING PROBS FOR PLTS. CONTRIBUTING TO THIS INCIDENT WAS THE FACT THAT THIS WAS MY FIRST FLT IN AND OUT OF MDT. A CONFUSING NOTE ON THE ARPT DIAGRAM STATING THAT THE RWY 31 HOLD LINE WAS 300 FT E OF TXWY F WHEN; IN REVIEW; IT APPEARS THAT THE E EDGE OF TXWY F IS THE HOLD LINE. THE WIGWAG LIGHTS WERE OFF OR INOP AND THE SIGNAGE AND TXWY HOLD LINE MARKINGS WERE POOR. TO CORRECT THE PROB; I SUGGEST THAT THE NOTE ON THE ARPT DIAGRAM BE REVISED TO BETTER DEPICT THE HOLD LINE; HOLD LINE SIGNAGE AND MARKINGS BE ENHANCED AND YELLOW IN-PAVEMENT HOLD SHORT GUARD LIGHTS BE PLACED ALONG THE HOLD LINE. SUPPLEMENTAL INFO FROM ACN 620658: WHAT MADE IT DIFFICULT TO SEE WAS THAT THE YELLOW LINES ARE PAINTED ON CONCRETE JUST PRIOR TO TRANSITIONING TO ASPHALT. IF YOU'RE NOT LOOKING FOR IT; IN ITS ALREADY UNUSUAL POS; YOUR EYES WILL NOTICE THE CHANGE OR CONTRAST IN PAVEMENT BEFORE THE LINE.