The 9000 Series was originally envisioned to be a fully automatic, driverless train car that would run on lines 9 and 10. However, TMB modified the order so that semi-automatic trains with cabs would also be ordered for lines 2 and 4. The cars were built by Alstom. They entered service starting in early 2008.
Alstom 9000 Series at Sagrada Familia, June 6, 2008