[3] They are equipped with high voltage cam switches, quill drive, and a microprocessor-controlled wheel slide protection system.

[3] Six sets were fitted with Linienzugbeeinflussung (LZB) in 1980 and 1981 and were used for driverless operation trials on the line to Großhansdorf station.

The automatic operation was observed by a conductor permanently sitting in the cab, they also had to dispatch the train in stations.

[3] The rebuilding became necessary due to structural issues with rust on load-bearing parts of the car bodies.

[6] This refurbishment will include the replacement of the old control equipment, the fitting of doors closing alarms, as well as the renewal of the interior and car bodies.