Editing Chiltern Main Line (section)

===Battery/diesel trains===
In September 2021, Class 168/3 ''HybridFlex'' battery/diesel trains were introduced, with lower emissions.<ref>{{cite web |date=22 July 2021 |title=Chiltern's first diesel-battery hybrid train makes passenger debut |url=https://www.railjournal.com/fleet/britains-first-diesel-battery-hybrid-train-makes-passenger-debut/ |website=railjournal.com}}</ref>  The trains operate on batteries, giving zero emissions when in stations or sensitive urban areas. However, the trains were removed from service in September 2023 as the diesel engine emitted high pollutants in stations.<ref>{{cite web |url=https://www.standard.co.uk/business/disappointment-as-chiltern-railways-scraps-hybrid-train-plans-b1105834.html |title=Disappointment as Chiltern Railways scraps hybrid train plans |first=Simon |last=Hunt |date=8 September 2023 |website=Evening Standard |access-date=15 July 2024}}</ref>