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The route commenced on 7 December 2019, originally numbered X140, as part of a reorganisation of routes in the lead up to the opening of the ]. Route X140 was introduced as a limited stop service between ] and ] bus stations and as a partial replacement for the all stops ], which was withdrawn between Hayes & Harlington and Heathrow at the same time.<ref> ] 7 December 2019</ref><ref>RTs return to Heathrow for route 140 farewell '']'' issue 778 January 2020 page 22</ref> Route X140 was initially operated by ].
The route commenced on 7 December 2019, originally numbered X140, as part of a reorganisation of routes in the lead up to the opening of the ]. Route X140 was introduced as a limited stop service between ] and ] bus stations and as a partial replacement for the all stops ], which was withdrawn between Hayes & Harlington and Heathrow at the same time.<ref> ] 7 December 2019</ref><ref>RTs return to Heathrow for route 140 farewell '']'' issue 778 January 2020 page 22</ref> Route X140 was initially operated by ].
Upon being put out to tender, on 4 September 2021 route X140 was taken over by ]'s ].<ref> ''Route One'' 3 November 2020</ref><ref>Latest tendered service awards ''Buses'' issue 789 December 2020 page 21</ref> However, due to delays in the delivery of new ]s and the refurbishment of the ] bodied ]s for the route, London Sovereign initially operated it with ] bodied ]s.<ref>RATP shuffles fleet ''Buses'' issue 800 November 2021 page 22</ref>
Upon being put out to tender, on 4 September 2021 route X140 was taken over by ]'s ] and ] garages.<ref> ''Route One'' 3 November 2020</ref><ref>Latest tendered service awards ''Buses'' issue 789 December 2020 page 21</ref> However, due to delays in the delivery of new ]s and the refurbishment of the ] bodied ]s for the route, London Sovereign initially operated it with ] bodied ]s.<ref>RATP shuffles fleet ''Buses'' issue 800 November 2021 page 22</ref>
On 26 August 2023, route X140 was renumbered SL9, becoming part of the ] network of orbital express bus routes.<ref> ''Route One'' 18 August 2023</ref><ref> Transport for London</ref><ref>{{Cite news |date=2023-08-26 |title=Superloop: West London express Heathrow to Harrow bus service launched |language=en-GB |work=]|url=https://www.bbc.com/news/uk-england-london-66620930 |access-date=2023-08-28}}</ref><ref>{{Cite web |last=Toms |first=Adam |date=2023-08-26 |title=New Superloop bus route launched as TfL says it's 'more than just a paint job' |url=https://www.mylondon.news/news/transport/newest-london-bus-superloop-route-27599331 |access-date=2023-08-28 |website=MyLondon |language=en}}</ref>
On 26 August 2023, route X140 was renumbered SL9, becoming part of the ] network of orbital express bus routes. The ] allocation was also withdrawn at the same time.<ref> ''Route One'' 18 August 2023</ref><ref> Transport for London</ref><ref>{{Cite news |date=2023-08-26 |title=Superloop: West London express Heathrow to Harrow bus service launched |language=en-GB |work=]|url=https://www.bbc.com/news/uk-england-london-66620930 |access-date=2023-08-28}}</ref><ref>{{Cite web |last=Toms |first=Adam |date=2023-08-26 |title=New Superloop bus route launched as TfL says it's 'more than just a paint job' |url=https://www.mylondon.news/news/transport/newest-london-bus-superloop-route-27599331 |access-date=2023-08-28 |website=MyLondon |language=en}}</ref>
The route commenced on 7 December 2019, originally numbered X140, as part of a reorganisation of routes in the lead up to the opening of the Elizabeth line. Route X140 was introduced as a limited stop service between Harrow and Heathrow Central bus stations and as a partial replacement for the all stops route 140, which was withdrawn between Hayes & Harlington and Heathrow at the same time. Route X140 was initially operated by Metroline.
On 26 August 2023, route X140 was renumbered SL9, becoming part of the Superloop network of orbital express bus routes. The Parr Road garage allocation was also withdrawn at the same time.
The route operates at a frequency of a bus every 12 minutes on weekdays and Saturdays and a bus every 15 minutes on Sundays. Between the hours of 23:00 and 07:00, the route is covered by an all stops night service, numbered N140, running every 30 minutes between Harrow Weald bus garage and Heathrow Central bus station.
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RATP Dev Transit London Alexander Dennis Enviro400EV in Harrow
Media related to London Buses route SL9 at Wikimedia Commons
