The UIC standardised a flat car as the UIC standard type 2 with a loading length of 12.64 m and a length over buffers of 14.04 m. The car was ordered by almost all European railway companies, both with and without side walls. From 1968 onwards, the Deutsche Bahn ordered a total of 2695 type 663 and 664 cars with side walls and 660 type 665 cars with side walls. The Deutsche Bahn wagons were special because their side walls were made of aluminium, while other European railway companies preferred side walls in steel. Most of the wagons purchased by the Deutsche Bahn are still in use, though several modifications have been made. Some have been fitted with type Y25 bogies and some have been converted into container cars.
