(articulated) and AN440LFs (low-floor) versions from Neoplan USA. PAT retired its last two Neoplan buses (AN460s) in December 2019 by providing free rides around downtown Pittsburgh for one weekend. Washington, D.C. In the 1980s, both PAT and WMATA, also known as Metro, discovered frame cracking issues with their Neoplan USA buses. However, they both later operated additional Neoplan buses, with WMATA ordering the AN460, a 60-foot articulated version. San Francisco AN440 and AN460 models were ordered by the San Francisco Municipal Railway (Muni) to replace their aging bus fleet and delivered starting in 2001, but they proved troublesome. Among the problems were insufficient, excessively noisy cooling fans (sounds reached up to 90 dB), faulty transmissions, maintenance intensive brake systems (requiring service every ), and cracking frames. The problems were compounded when Neoplan eventually refused to fix the problems, instead choosing to repossess the remaining spare parts and abruptly abandon its San Francisco overhaul yard in September 2005. The Muni Neoplan USA buses are unique in that they have rear windows, with the air conditioning unit mounted on the roof. St. Louis Bi-State Development Agency, dba Metro, has a small fleet of Neoplan Buses for its MetroBus service, and since March 30, 2009, has retired them. See also List of buses References Bus test reports External links www.neoplan.de — Neoplan in Germany The History Of The Neoplan Order at SEPTA AN440 Buses of the United States Single-deck buses Articulated buses Natural gas vehicles Vehicles introduced in 1981