The 5000 Series cars are the oldest currently in operation on the Madrid Metro, with the oldest subseries dating back to 1974. The series has several subserieses, with the last one being delivered in 1993. Currently, the 5000 Series cars can be found on Line 6. They are boxy in their design, like the 2000A Series. They are also the only Madrid Metro cars to not have passenger operated doors. As the number of 9000 Series cars increases, the 5000 Series cars will be retired.