Type "Ptb"

• Manufacturer: Duewag
• Years of construction: 1973–1978
• Seating/standing capacity: 62/180
• Length: 28.72 m
• Width: 2.58 m
• Height: 3.26 m
• Weight: 34.7 t
• Motor output: 2 x 120 kW
• Number in fleet: 59

The widening of the Pt units (“Pt” plus “b” for “breadth” = “Ptb”) in the door area makes it possible for these vehicles to be deployed on the underground routes that are 33 cm wider. Ptb units, for instance, can be used on routes U4 and U5 (Konstablerwache to mainline railway station) and on underground routes U6 and U7.