As I mentioned in my Sunday posting regarding Line 4 of the Paris subway, I want to go through some possible scenarios that could play out if full automation were to take place. Right now, automation is in the planning books for Line 4, as it is the second busiest line in the Paris Metro system. With the success of Line 14 being a fully automated line, the RATP began to research automating other lines in the system. Possible candidates include Lines 4, 6, 7, 11, and 13 due to their passenger loads. Line 13 is currently being fitted with platform screen doors, making it a likely candidate for automation within the next 15 to 20 years. I would heavily suspect that once Line 4 is complete, Line 13 will be next on the list.