testing of the vehicles was delayed several months after it was discovered that current traffic regulations prohibited transit vehicles as old as these from operating in passenger service, TCSA's existing fleet having been granted an exemption some years ago. The regulations were amended in early 2015, and testing and training with the ex-Lucerne NAW trolleybuses began in mid-February 2015. They began to enter service on 23 March 2015, and all 10 had entered service by 1 April. TCSA later purchased another eight trolleybuses of the same type from Lucerne. Four arrived in August 2017 and entered service in October 2017, while the final group of four arrived at the end of November 2017 but had not yet entered service as of January 2019, more than a year later. Current fleet , the serviceable fleet included 23 trolleybuses. In January 2019 the number was unchanged, but with 18 newly acquired ex-Lucerne trolleybuses having replaced all of the fleet's older Swiss trolleybuses. Pullman-Standard trolleybuses built between 1946 and 1952 still made up more than half of the active (in service) fleet in 2015, but by 2019 they accounted for only nine of the 23 active vehicles. In 2022 it was reported that all Pullman-Standard trolleybuses were stored out of service and only the ex-Lucerne NAW vehicles were in operation. Notes: n/a = not applicable (vehicles not rebuilt, still in original form); "ex-Santiago" in this table refers to the 1947–78 trolleybus system there. †: Bold typeface indicates a vehicle active (in service) as of January 2019. Note †: Bold typeface indicates a vehicle active (in service) as of January 2019. Of the last three active ex-Geneva trolleybuses, No. 612 was retired after sustaining major damage when it crashed into a building in November 2010, and it was scrapped in 2012, and as late 2014 Nos. 617 and 099 had been out of service since mid-2013 and March 2014, respectively, with problems with their compressors and suspension. Ex-Zurich FBW No. 504 was retired after being heavily damaged by fire in February 2012. After the 10 ex-Lucerne NAW trolleybuses entered service, in 2015, the indefinite withdrawals of the last two Geneva vehicles (617 and 099) became permanent, and Shenfeng trolleybuses 603 and 607 were also retired. However, Shenfeng 607 returned to service in December 2015. Ex-Schaffhausen 203, the last of the older generation of secondhand Swiss trolleybuses, from the 1960s, was finally retired in May