Air Carrier pilot reported an air carrier taxiing onto the runway had to take evasive action to avoid the reporter's aircraft which was at the hold short line. B737 and A320 aircraft taxiing on the new Taxiway J centerline markings at DCA do not remain clear of the north-south hold short line.

Narrative

Runway 19 hold short line has been moved. Taxiway Juliet center line markings have been moved 75 feet west. There is a NOTAM for non-standard markings. This change has changed the Tower controller's options for aircraft movements at the hold short line. This is an accident waiting to happen! We were number 1 in the hold bay. Tower instructed us to pull up to the hold short line of Runway 19. Tower changed the plan and cleared a B737-800 to position and hold. This aircraft was holding short on the taxiway Juliet line. As the 737 started to roll it quickly became apparent that the left wingtip of 737 family aircraft hangs over the north-south hold short line by 15 to 20 feet. Same for A320 family aircraft. Luckily; the 737 pilot realized his left wing tip to my nose clearance was not sufficient and he moved off the taxiway Juliet line to allow enough clearance for him to taxi on the runway. Terrible engineering and measurements! Never should have moved the Juliet taxi line! Tower controllers had standard operating procedures and overnight they were made obsolete. Was any training conducted for Tower Controllers with new SOPs? Repaint the hold short lines back the way they were. If not; at least repaint the lines such that there is proper wing-tip clearance by making proper measurements!