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=== Inaugural service ===
On August 10, 2024, Caltrain concluded its tests of the Stadler KISS on the line with a non-revenue special run from 4th and King to Diridon Station and back.<ref name="First Pax 2024">{{cite web | title=Caltrain Welcomes First Passengers on New Electric Trains | website=Caltrain | date=August 10, 2024 | url=https://www.caltrain.com/news/caltrain-welcomes-first-passengers-new-electric-trains | access-date=August 11, 2024}}</ref> Caltrain Board Chair Dev Davis, Governor [[Gavin Newsom]], [[Federal Railroad Administration]] chair [[Amit Bose (government official)|Amit Bose]], U.S. Senator [[Alex Padilla]], U.S. Representatives [[Nancy Pelosi]], [[Kevin Mullin]] and [[Anna Eshoo]], [[California State Transportation Agency]] chief Toks Omishakin, noted transit advocates and state legislators [[Phil Ting]] and [[Scott Wiener]], and the mayors of San Francisco and San Jose, [[London Breed]] and [[Matt Mahan]], respectively, were among the passengers.<ref name="Forrest 2024">{{cite web | title=Press Kit |last=Forrest|first=Julia| website=Canva | date=August 10, 2024 | url=https://www.canva.com/design/DAGLyjeLzxo/d_tHBkjd5J-6WIAvchWrOQ/view?utm_content=DAGLyjeLzxo | access-date=August 11, 2024}}</ref> Revenue service began the next day, and was scheduled to ramp up to its highest frequency by September 21.<ref name="Cano 2024">{{cite web | last=Cano | first=Ricardo | title=Why California's high-speed rail project could look different if Trump regains the presidency | website=San Francisco Chronicle | date=August 11, 2024 | url=https://www.sfchronicle.com/bayarea/article/california-high-speed-rail-trump-19628640.php | access-date=August 11, 2024}}</ref> On that date, Caltrain held a
==Funding==
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Power is supplied to the trains through an [[overhead line|overhead contact system]] (OCS), consisting of a messenger wire, which assumes a
The [[25 kV AC railway electrification#2 x 25 kV autotransformer system|2×25 kV autotransformer electrification system]] includes a third energized parallel negative feeder wire which helps control [[electromagnetic field]] propagation.<ref name=DEIR-14-ch2 /><ref name=HSR-Sibal>{{cite report |url=http://www.hsr.ca.gov/docs/programs/eir_memos/Proj_Guidelines_TM3_1_1_1R02.pdf |title=Technical Memorandum: Traction Power 2x25 kV Autotransformer Feed Type Electrification System & System Voltages, TM 3.1.1.1 |date=April 2010 |author=Sibal, Vinod |publisher=California High-Speed Rail Authority |access-date=14 June 2018}}</ref> The feeder wire is electrified at the same voltage and frequency, but is shifted 180° out of phase so the voltage difference between the contact wire and the feeder wire is always 50kV.<ref>{{cite web |url=http://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M169/K717/169717211.docx |title=Resolution SED-2 adopting safety requirements governing the design, construction, installation, operation, and maintenance of the 25 kV AC (Alternating Current) railroad electrification system of the Peninsula Corridor Joint Powers Board (Caltrain) on the San Francisco Peninsula Rail Corridor |date=10 November 2016 |publisher={{DOClink}} Public Utilities Commission of the State of California, Electric Safety and Reliability Branch, Safety and Enforcement Division |access-date=14 June 2018}}</ref> The choice of a 2×25 kV autotransformer system means more traction power facilities are required in total, but also requires fewer traction power substations.<ref name=HSR-Sibal />
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