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===Environmental effects===
Replacing the diesel locomotives with electric multiple units is expected to reduce air pollution and noise.<ref>{{Cite news|last=Swan|first=Rachel|date=2017-11-27|title=Some Mission Bay neighbors fuming over Caltrain's diesel dust|url=https://www.sfchronicle.com/bayarea/article/Some-Mission-Bay-neighbors-fuming-over-12383764.php|access-date=2022-02-04|website=San Francisco Chronicle|language=en-US}}</ref> The reduced air pollution would improve the health of [[El Palo Alto]], a coastal redwood tree and historical landmark which stands about {{convert|25|ft}} away from the Caltrain tracks and lends its name to [[Palo Alto, California|Palo Alto]]. Coal soot and [[diesel exhaust]] are presumed to have killed parts of the tree's crown since the 19th century.<ref>{{cite news|title=The Unlikely Survival of the 1,081-Year-Old Tree That Gave Palo Alto Its Name|first=Jim|last=Robbins|work=[[The New York Times]]|date=June 26, 2021|access-date=June 26, 2021|url=https://www.nytimes.com/2021/06/26/us/palo-alto-redwood.html}}</ref> The lack of exhaust emissions will benefit air quality throughout the railway corridor, and the new units are significantly quieter than the previous stock. However, the lower noise levels have resulted in Caltrain warning the public to take extra care at crossings.<ref>{{cite web |url=https://www.railway-technology.com/news/caltrain-electrification-on-track/?cf-view |archive-url=https://web.archive.org/web/20250114111033/https://www.railway-technology.com/news/caltrain-electrification-on-track/ |archive-date=January 14, 2025 |url-status=live |title=Caltrain electrification “on track” |first=Patrick Rhys |last=Atack |publisher=Railway Technology |date=March 15, 2024}}</ref>▼
▲Replacing the diesel locomotives with electric multiple units is expected to reduce air pollution and noise.<ref>{{Cite news|last=Swan|first=Rachel|date=2017-11-27|title=Some Mission Bay neighbors fuming over Caltrain's diesel dust|url=https://www.sfchronicle.com/bayarea/article/Some-Mission-Bay-neighbors-fuming-over-12383764.php|access-date=2022-02-04|website=San Francisco Chronicle|language=en-US}}</ref> The reduced air pollution would improve the health of [[El Palo Alto]], a coastal redwood tree and historical landmark which stands about {{convert|25|ft}} away from the Caltrain tracks and lends its name to [[Palo Alto, California|Palo Alto]]. Coal soot and [[diesel exhaust]] are presumed to have killed parts of the tree's crown since the 19th century.<ref>{{cite news|title=The Unlikely Survival of the 1,081-Year-Old Tree That Gave Palo Alto Its Name|first=Jim|last=Robbins|work=[[The New York Times]]|date=June 26, 2021|access-date=June 26, 2021|url=https://www.nytimes.com/2021/06/26/us/palo-alto-redwood.html}}</ref>
===Rolling stock===
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