The first two digits reveal the year of construction: this tram dates from 1975. Maintenance and modernisation are carried out by the Bonn workshop in such a way that the vehicle can still reliably handle the heavy services between Bonn and Cologne. At the moment the photo was taken, the tram was 51 years old, but few passengers would suspect this, as the interior has also been refurbished in the meantime—probably more than once.