Biene Maja
They were very popular with passengers, who nicknamed them "Akkublitz" ("Battery Lightning"), "Säurebomber" ("Acid Bombers"), "Steckdosen-InterCity" ("Socket InterCitys"), "Taschenlampen-Express" ("Pocket Torch Express"), or "Biene Maja" ("Maya the Bee" – because of the sound they made when under way).