They moved an entire town to this spot
In 1878 the railroad wanted a line from Oakland that went around the hills rather than over them, because hills meant helper engines and helper engines meant money. Where that line met the Central Pacific, three miles east of a place called Ellis, a town was founded on September 8, 1878. It was named for Lathrop J. Tracy, a grain merchant and railroad director from Mansfield, Ohio. Which is a small joke this valley has never acknowledged: there is a city called Lathrop twelve miles northeast, and Tracy is named after a man called Lathrop.
Ellis did not survive the decision. The station was abandoned after Sunday, September 1, 1878, and every one of its buildings was picked up and moved to Tracy. People did not simply relocate. They brought the town with them.
Then in March 1894 the railroad moved its entire headquarters here from Lathrop: equipment, engines, buildings, all of it. Hold that beside the Lathrop story, where Leland Stanford founded a town because Stockton would not agree on a right-of-way. Stockton lost the town, Lathrop lost the headquarters, and Tracy got both the junction and the payroll. Three cities inside twelve miles, and one railroad rearranging all of them.
Agriculture arrived properly once the first irrigation district was established in 1915, and the town grew fast. That is why the seal has two figures facing opposite directions. Tracy has never been only one thing, and the modern version is the same: Amazon, Costco, Crate and Barrel, FedEx, Medline, Safeway, Smuckers, and US Cold Storage all run operations here. The Safeway distribution center opened May 1, 1992 on Schulte Road in the Patterson Pass Business Park, earmarked for 1,600 employees and serving 245 Northern California stores. Costco opened next door the same year. The junction never stopped being the point.