Running between Roseville and the Port of Oakland, the Martinez Sub, also referred to as the Cal-P (short for California Pacific) is the main artery into the Bay Area. Traversed daily by San Joaquin, Capitol Corridor, and long distance Amtrak trains, top speed on this route is a hair-whipping 79 miles per hour (between Emeryville and Richmond and Benicia and Sacramento). Click the interactive map to the left to learn more!

Way past it's heyday, the Niles Sub sees daily Capitol Corridor trains, as well as the MOAOA and the MNPMI. Beginning in Oakland, the Niles Sub travels directly south. Cutting through Elmhurst, San Leandro, and Hayward, top speed until Niles Junction is 79. At Niles Junction, the convergence of the Warm Springs, Oakland, and Niles Subs, this subdivision takes a hard westward turn towards Fremont. This short section of track, spanning only about 6 miles, is heavily traversed by the daily ILTLT, INPOA, and Capitol trains. On Sundays, the ZG2OAB flies through here. At the southernmost end of this sub, the Niles Sub wyes onto the Coast Sub. Click the interactive map to the left to learn more!

Once home to some of the most prominent trains on the West Coast, the Coast Sub has seen better days. From Gilroy south, the tracks only host a a couple of locals and the Coast Starlight. However, North of Gilroy, this route is still a backbone of south bay railroading. From Elmhurst (near the Oakland Coliseum) to Carter (in Newark), the Coast Sub is TWC (Track Warrant Control). Because it is dark signal territory, this stretch has been coined "Baby Coast" by local railfans. However, south of Newark, it becomes CTC controlled, and hosts weekday ACE trains, daily Capitols and the Coast Starlight. It has been a long time since regular revenue road freights have travelled the Coast Sub, but don't let that fool you! It still hosts some locals. Click the interactive map to the left to learn more (the map only goes as far as Watsonville)!

As the unappreciated backbone of the Western Pacific's Transcontinental Railroad, the Oakland Sub is alive and well! Although it doesn't see nearly as many trains as it used (as recently as 2015), there are still ACE trains, the INPOA, ILTLT, and the ZG2OAB. Ex-Western Pacific trackage, these rails technically begin at Jack London Square and travel south, pacing the Niles and Coast Subs, until Niles Junction, however those tracks have been long abandoned, as the WP no longer competes with the Southern Pacific (they are both part of UP now). Now, the operational tracks begin a few miles west of Niles Junction and ends in Stockton. Travelling through Niles Canyon, Altamont Pass, and the Central Valley, this may be the most photogenic route in the Bay Area. These tracks are also home to the Lathrop ICTF, where most of Union Pacific's northern California intermodal operations occur. Click the interactive map to the left to learn more!

A primarily industrial sub, the Warm Springs is all TWC. With track speeds maxing out at 25 mph, no heavy freights belong here. However, it is a very important subdivision as Ford and Nissan have large operations in Milpitas, and the Union Pacific serves there needs via this route. In addition, most south bay locals are based out of either the Warm Springs Yard or the Watsonville Yard. No passenger runs operate on the Warm Springs Sub. Click the interactive map to the left to learn more!

The Tracy Subdivision is pretty much abandoned. Although it is not declared out of service in the Union Pacific timetable as of 2017, it hasn't been used south of Pittsburg in many years. It is strictly a switching line east of Port Chicago, traversed daily by only the LRJ48. However, between Martinez and Port Chicago, many San Joaquin trains travel this connector to the BNSF everyday. Click the interactive map to left to learn more!