The fourth and final section of the Guadalupe line opened on April 25, 1991, with 9.7 miles of track, continuing down the median of State Route 87 until it approaches the interchange State Route 85, where the tracks briefly exit the median to serve Ohlone/Chynoweth station. After stopping at Ohlone/Chynoweth station, Blue Line trains enter the median of State Route 85 to continue on to Santa Teresa station in South San Jose. State Route 85 was also built to accommodate the light rail line, and had not opened to vehicle traffic when trains started running. The final section of the Guadalupe line also included a spur track to the Almaden Valley, that was served by the Ohlone/Chynoweth–Almaden line until December 2019, when it was eliminated due to low ridership.