{{Short description|Faster San Francisco–San Jose rail service}}
{{use mdy dates|date=May 2024}}
{{aboutredirect|the "Baby Bullet" express train service offered by Caltrain|the racing aircraft built by Edward Bayard Heath|Heath Baby Bullet|the blender|Magic Bullet (appliance)}}
{{Infobox project
| name = Caltrain Express (CTX)
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| key_people =
| established = {{Start date|2002|04|04}} (contract award)
| disestablished = {{End date|2004|06|04}} (revenue service){{clarify |reason=wording seems to suggest that the service is discontinued ("disestablished", whereas Baby Bullet is in service|date=September 2022}}
| funding =
| budget = US$110 million
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}}
The '''Caltrain Express''' ('''CTX''') project was implemented from 2002 to 2004 and led to the establishment ofestablish the '''Baby Bullet''' express service (now known as simply the '''Express''' service since September 21, 2024), which shortened the transit time between [[San Francisco]] and [[San Jose, California|San Jose]], and certain stations in between. New locomotives and rolling stock were purchased for dedicated express service, bypassing most stations; [[Quadruple-track railway|quad-track overtake sections]] were added in two locations along the Peninsula Corridor right-of-way to allow express trains to pass slower local trains that were making all stops; tracks were also upgraded with [[Track (rail transport)#Continuous welded rail|continuous-welded rail]]; a [[centralized traffic control]] system was added; and [[railroad switch|crossovers]] were added every few miles to allow single-tracking trains around disabled trains. Congresswoman [[Jackie Speier]], then serving as a California State Senator, is credited with securing the funding for CTX and one of the new locomotives acquired for the project is named for her as a result. During commute hours, the Baby Bullet is up to 20% faster than driving south from San Francisco to San Jose.
