
Eurobus Welti-Furrer AG: the articulated bus number 73 (Mercedes-Benz O530G Citaro, registration TG-229684) is operating on the ETH eLink line, which links the two campuses of the Eidgenössische Technische Hochschule Zürich university, at Unterführung Polyterrasse, in the center of Zürich and Hönggerberg.
This venerable veteran bus was put into service in 2006 by Cars alpins Neff (number 8, registration TG-18880), where it served PostAuto. At an unknown time, it was sold to Eurobus and renumbered 4235, although it continued to operate for PostAuto. In 2021, it was renumbered 73, re-registered TG-229684, and painted white, to serve as a reserve for the three then new Mercedes-Benz eCitaro G articulated electric buses serving this university line.
Apparently, in March 2025 it is still in service (19 years after being put into service), with the new number 17, being used for rail replacement services.