The line segment is divided into the following subdivisions:
· UP Fresno Subdivision from (North Bakersfield and) North Lathrop to Elvas
North Lathrop (MP 92.9) is the point at which the line coming north from Bakersfield and Fresno (which is heading west at this point) meets the line coming east from Martinez (which is heading north at this point) at a wye junction, from which it continues northward, initially as Double Track (DT) Automatic Block Signals (ABS) with a speed limit of 70 mph. This line used to have mileposts indicating its mileage from San Francisco by the line coming in from the west/south, but since the UP merger its has been renumbered to have mileposts decreasing in sequence from those found in the line coming north from Fresno and Bakersfield.
The line passes a grade crossing just north of the wye but south of the signals, a spur trailing in from the west, two rail-served industries to the west, a grade crossing, detectors at MP 91.1, French Camp (MP 88.3), the erstwhile flat crossing of a Tidewater Southern line heading for the Port of Stockton, a grade crossing, extra track to the west, a facility to the west, an angled grade crossing, Hunter Street (MP 87.1), where the speed limit temporarily falls to 40 mph, there are crossovers, a connector from McKinley Avenue on the parallel ex-WP line to the east trails in, and connections to the Hunter Street Industrial Lead, a spur to grain silos, a spur to shuttle-enabled destination grain silos with four tracks to the west, an angled grade crossing, two extra tracks on the west side, and Scotts (MP 84.8), where the speed limit is 60 mph and the ex-WP line trails in from the east side.
The ex-SP line through Stockton is used for both the route from Stockton to Haggin (ex-WP) and that from Stockton to Elvas (ex-SP). The ex-SP line is Two Main Tracks, CTC-controlled. Once the 30 mph speed limit at the flat crossing with the BNSF line is cleared, speeds are 40 mph through Stockton. There is a street briefly alongside to the west, extra track on the west side, a bridge over a divided street, and extra track on the west side, south of the BNSF crossing. At the former location of Stockton Tower (BNSF Stockton Sub Xing, MP 84.7), the ex-SP Fresno Subdivision crosses the BNSF Stockton Subdivision on a flat crossing with two tracks in each direction. In addition to little-used connectors in the south-to-east (lower right) and south-to-west (lower left) quadrants, there is an east-to-north connector (upper right) quadrant, built in the mid 1990s after the mergers, from the north track of the BNSF at Keddie Junction to Church (MP 84.5), which also has crossovers to permit access to both main tracks.
There are two grade crossings, a grade crossing at Church Street, a grade crossing, dual road bridges overhead, a spur at Market (MP 84.2), for storage of Altamont Commuter Express trains, which, past one more grade crossing, use the former SP depot on the west side of the line at Stockton (ACE), MP 84.0, with platform and two-storey depot to the west of the tracks. A connection to Central California Traction heads east at Flora Street (MP 83.8). One mile north of the depot, past a bridge over a divded street, three grade crossings, and a bridge over a street, at the former WP flat crossing at El Pinal (MP 83.0/95.1), the ex-WP single-track line curves north-northwest while the former SP Two Main Track line continues north.
Once past the 40 mph speed limit through the junction at El Pinal, a spur edges away on the west side, there is a grade crossing with an angled street, a grade crossing with a divided street, and the crossovers at North El Pinal (MP 82.3), and the speed limit rises to 79-70. The line bridges the Calaveras River, and passes a grade crossing, a bridge over a divided street, and housing to the west, and the two Main Tracks reduce to one at Akers (MP 80.0). There is a spur at Castle (MP 79.6), a bridge over a divided street, a detector at MP 78.5, a grade crossing, a bridge over drainage, a grade crossing, a bridge over drainage, a road alongside to the west, a grade crossing, a 1,560 ft. east side siding at Tomspur (MP 76.9-74.8), where there is also a spur, a grade crossing, housing to the west, a 6,070 ft. east side siding at Lodi (MP 73.3-71.9), where the speed limit falls to 45 mph through the town, with a bridge over a divided street and a grade crossing within the siding, a grade crossing, the former SP depot on the west side of the line near the grade crossing with the street that has a big sign promoting the town bridging across it, west of the track, two grade crossings, a spur heading west on the north side of town, another grade crossing and a bridge over a divided street.
The speed limit rises to 70-65, across the deck girder bridge over Mokelumne River, past the spur at Urgon (MP 69.9), as the line bends from just east of north to just west of north, and a grade crossing just south of the 8,350 ft. siding at Acampo (MP 69.8-68.1), with a dirt track grade crossing and a grade crossing within the siding, and 79-70 thereafter, past two grade crossings, a bridge over a road, a detector at MP 65.7, a grade crossing, housing to the west, a grade crossing, a road alongside to the west, a grade crossing, Galt (MP 63.3), where the ex-SP Ione branch heads northeast, a grade crossing, a road alongside to the west, a grade crossing, Two Main Tracks through Need (MP 62.2-59.5), with the road still alongside to the west, and single again thereafter, past two grade crossings, ponds on the west side, seven dirt track grade crossings, a bridge over a dirt road, a road bridge overhead, a detector at MP 55.5, a spur trailing in on the west side, Two Main Tracks again through Elk Grove (MP 55.0-52.1), with a grade crossing in the 2MT, and single again thereafter.
The line passes two bridges over drainage, a grade crossing, a bridge over a canal, a grade crossing, an acute angled grade crossing with a divided street, Meadows, a bridge over drainage, a grade crossing with a divided street, a bridge over drainage, a grade crossing, two spurs heading away on the west side, a grade crossing with a divided street, a bridge over drainage, a Hold Signal at South Florin (MP 47.6), two spurs on the west side, a grade crossing, another Hold Signal at North Florin (MP 44.7), as the line enters the Sacramento built-up area, a detector at MP 44.6, with the Sacramento Army Depot adjacent to the west, with two spurs on the west side, a spur track on the east side from that depot trailing in further north, a grade crossing, four extra tracks to the east, and an acute angled grade crossing just south of Polk.
Two Main Tracks begin again at Polk (MP 43.0), where there is a wye junction with the California Central Traction line coming in from the east (which once continued to the west on the other side of the ex-SP line). The line curves to the north-northwest, past a spur to the west, a grade crossing, and extra track to the west, and the Folsom branch trails in from the east at Brighton (MP 41.8), where the Sacramento light rail line passes overhead on a concrete bridge, just south of the dual US 50 bridges overhead. There is a bridge over a divided street, a street to the west, the line turns almost north again at the Intermediate Signals at Hopfen, a street to the west appearing and then turning away, an embankment, the tracks becoming widely spaced, crossovers, and the line turns west-northwest at South Elvas (MP 39.5), where the speed limit falls to 40 mph, past a street alongside to the west and a bridge over a street.
The line ends at a wye junction with the Sacramento to Roseville main line at Elvas (MP 38.9), former location of Elvas Tower, where the speed limit is 25 mph through the junction. The Roseville line heads away north, and the Sacramento line southwest at the wye. Except for the passenger trains heading west to Sacramento, almost all the traffic from the Stockton line turns north at Elvas to head for the major freight yard at Roseville.