[[File:Caltrain train 1.jpg|thumb|250px|Northbound Baby Bullet in 2005]]
The '''Caltrain Express''' ('''CTX''') (also known as the Baby Bullet) project was implemented from 2002 to 2004 and led to the establishment of commuter railroad [[Caltrain]]'s "'''Baby Bullet"''' express service, 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; [[Double-track railway#Quadruple track|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 key commute hours, the Baby Bullet is up to 20% faster than driving south from San Francisco to San Jose.
