Editing AC Transit (section)

===Alternative power===
[[File:AC Transit 666, Steam Bus ACT268 (12915267905).jpg|thumb|AC Transit GM New Look bus #666, converted to steam power in the early 1970s]]
In 1969, AC Transit received a grant and converted bus #666 to steam power, which ran in revenue service between 1971 and 1972. The propulsion system was designed by William Brobeck and used a triple-expansion reciprocating steam engine; power was improved compared to the original six-cylinder [[Detroit Diesel]] [[Detroit Diesel Series 71|6V71 engine]] and emissions were reduced, but fuel consumption was higher than the conventional diesel bus.<ref name=TT-6902>{{cite magazine |url=http://www.actransit.org/wp-content/uploads/11-08.pdf |title=Government grant gives financial Support to bus test of steam power |date=February 1969 |magazine=Transit-Times |publisher=AC Transit |volume=11 |number=8}}</ref> The steam system is a closed loop. Exhaust steam is condensed and returned to the steam generator, which is an externally-fired boiler that uses {{convert|1400|ft}} of coiled steel tubing.<ref name=ACT-steam>{{cite web |url=http://www.actransit.org/wp-content/uploads/Steam-Bus.pdf |title=Introducing the modern steam bus |publisher=AC Transit |date=1971 |access-date=7 January 2019}}</ref> Prior to entering service, the steam bus was exhibited in Washington DC<ref>{{cite magazine |url=http://www.actransit.org/wp-content/uploads/14-05.pdf |title=Steam Bus unveiled in Washington, D.C. Senators Cranston, Tunney among riders |date=November 1971 |magazine=Transit-Times |volume=14 |number=5 |access-date=10 January 2019}}</ref> and to the public.<ref>{{cite magazine |url=http://www.actransit.org/wp-content/uploads/14-07.pdf |title=Steam Bus unveiled to public |date=January 1972 |magazine=Transit-Times |volume=14 |number=7 |access-date=10 January 2019}}</ref> Bus #666 completed {{convert|3403|mi}} in revenue service when the trial ended in September 1972,<ref>{{cite magazine |url=http://www.actransit.org/wp-content/uploads/15-04.pdf |title=Steam bus project completed successfully After operation in revenue service |date=October 1972 |magazine=Transit-Times |volume=14 |number=7 |access-date=10 January 2019}}</ref> and the diesel engine was subsequently reinstalled in the bus.<ref>{{cite magazine |url=http://www.actransit.org/wp-content/uploads/15-08.pdf |title=Steam bus reconverted As experiment ends |date=February 1973 |magazine=Transit-Times |volume=14 |number=7 |access-date=10 January 2019}}</ref>
[[File:AC Transit route 12 bus on Broadway, April 2021.jpg|thumb|AC Transit bus #9076, a New Flyer XHE40 powered by a hydrogen [[fuel cell]] ]]
AC Transit is the lead agency of Zero Emission Bay Area (ZEBA), a consortium of five Bay Area transit agencies (AC Transit, [[Golden Gate Transit]], [[San Francisco Municipal Transportation Agency|SFMTA]], [[SamTrans]], and [[Santa Clara Valley Transportation Authority|VTA]]) demonstrating fuel cell buses.<ref>{{cite web |url=http://www.actransit.org/environment/the-hyroad |title=The HyRoad |publisher=AC Transit |access-date=10 January 2019}}</ref> The District began the HyRoad program in 1999 and tested several fuel cell buses with new hydrogen fuelling infrastructure, including the Ballard/[[XCELLSiS]] ZEbus (a [[New Flyer Low Floor|New Flyer F40LF]] with a Ballard fuel cell) in November 1999.<ref>{{cite report |url=http://www.actransit.org/wp-content/uploads/board_memos/06bcec.pdf |title=Short Range Transit Plan, FY2001-FY2010 |chapter=2 |publisher=AC Transit |access-date=10 January 2019}}</ref> Three [[hydrogen fuel cell|hydrogen-powered]] buses, based on the Van Hool A330, operated in revenue service from 2006 to 2010. AC Transit took delivery of 12 additional third-generation fuel cell buses, based on the Van Hool A300L in 2011. In 2019, AC Transit began operating 11 additional hydrogen fuel cell buses from New Flyer, one of which is a 60-foot articulated bus, and 5 battery electric buses from New Flyer.<ref name="2019-AC-status">{{cite web|url=https://actransit.legistar.com/LegislationDetail.aspx?ID=3857480&GUID=68B1B00F-29CF-4A8D-8C34-17CF2FD44218/|title=AC Transit Board Bus Fleet Update|date=13 February 2019|publisher=AC Transit}}</ref>