Rail in 2014 and were delivered in 2016-19. Two prototype 4-car sets were initially ordered. In 2015, a production order for 64 sets was placed which are scheduled to be delivered in 2017-2021. These will replace the present D57/D60 units currently running on U55, as well as F74, F76 and F79 units that runs on U5, U7 and U8, and also expand the fleet for the U5 extension. References Berlin U-Bahn Electric multiple units of Germany Lists of rolling stock