Freight trains operate through the intersection 24 hours a day; Altamont Corridor Express and Amtrak California San Joaquins passenger trains also utilize the junction.
Two of the sides of the "diamond" are complete and allow interchanges between the north-east and south-west legs.
By 2020 the junction was the most congested in California,[2] with the level-crossing design contributing to delays throughout the state's rail network.
[1] The north–south flyover tracks will be constructed approximately 200 ft (61 m) to the east of the existing UP Fresno Subdivision, from the UP Stockton Yard to the at-grade crossing at Weber Avenue.
Road traffic on Charter, Hazelton, and Scotts will be grade-separated under new rail bridges, while the existing at-grade crossings at Church and Lafayette would be closed.