From a site 2014:


Palmdale Cutoff Freights

This is a list of freight trains that run on the old SP Palmdale Cutoff Line between West Colton, CA and Palmdale, CA. This line is now part of the Union Pacific Mojave Subdivision. This list is by no means perfect, and other trains not listed may also run over this line. As of the date of this writing the info listed should be accurate.

This list was last updated on: 2014-12-09


AOA__
ABE__
AMP__ Autos Oakland, CA
Benicia, CA
Milpitas, CA --- ---
Southbound loaded and empty autos trains from Oakland (OA), Benicia (BE), and Milpitas (MP) (used to be MI) can run over the Palmdale Cutoff. These are run as needed, and don't tend to hold to a schedule when they do run. Destinations can include Nogales, AZ (NG); El Paso, TX (EP); and Eagle Pass, TX (EG) among others. As of the spring of 2014 a lot of the trains from Milpitas at least have moved over to running south over the Coast Line, and hence are not using the Palmdale Cutoff.
IDITA
IDITAX Intermodal Dallas Intermodal Terminal (DIT), TX Tacoma, WA Sat (see below)
This train is typically a once a week intermodal move from DIT, TX to Tacoma WA. It typically departs DIT on a Thursday and passes over the Palmdale Cutoff early Saturday morning, often before the sun is up. Extra sections can be run as the IDITAX as traffic warrants.
IOALB
IOACI
IOALBR
IOACIR Intermodal Oakland, CA ICTF (Long Beach), CA
City of Industry, CA ---
These trains move empty intermodal equipment from Oakland to various LA Basin yards. Much of this traffic is currently running on the Coast Line, though occasionally these trains will run down the Valley and over the Palmdale Cutoff. These are typically run as needed and don't tend to hold to a schedule.
ZLCBR Priority Intermodal LATC (Los Angels), CA Brooklyn Yard (Portland), OR Mon-Sun
Northbound Z-train from ICTF (Shops Yard) in Los Angels to Brooklyn Yard in Portland Oregon. This train is made up of a mix of trailers and containers, with all power on the head end. It usually departs LATC around midnight. It will often make its run over the Palmdale Cutoff before sunrise, but can on occasion will be on the cutoff during the first few hours of daylight. On occasion this train can take the Saugus Line though it typically will not currently. Note: I believe this train is currently running 6 days a week, but need to confirm which days still.
ZBRLC Priority Intermodal Brooklyn Yard (Portland), OR LATC (Los Angels), CA Mon-Sun
Southbound Z-train from Brooklyn Yard in Portland, OR to ICTF (Shops Yard) in Los Angels. This train is made up of a mix of trailers and containers, with all power on the head end. It can show up on the Palmdale Cutoff from a few hours before dawn to about noon, though the earlier end is more common. On occasion this train can take the Saugus Line though it typically will not currently. Note: I believe this train is currently running 6 days a week, but need to confirm which days still.
MFRWC Manifest Fresno, CA West Colton, CA Wed, Fri, Sat/Sun
A large manifest train that runs from Fresno south to West Colton. This train usually does not have any DPUs. Tends to go through Palmdale in the early morning. It should be noted that this train originates at night on Tue, Thur, Sat, but will be seen on the Palmdale Cutoff in the morning on Wed, Fri, Sun.
MWCFR Manifest West Colton, CA Fresno, CA Mon, Wed, Fri
A large manifest train that runs from West Colton north to Fresno. This train usually does not have any DPUs. Tends to pass through Palmdale in the late afternoon.
QRVWC
QRVWCB
QRVWCC
QRVWCX Quality Manifest Roseville, CA West Colton, CA Mon-Sun
A large manifest train that runs from Roseville south to West Colton. On most days a second scheduled train (QRVWCB) departs Roseville about 12 hours after the fist scheduled train (QRVWC). These trains almost always have DPUs on the rear or cut in mid train. When traffic is heavy, a third scheduled train (QRVWCC) and/or an extra sections (QRVWCX) can be run. These can vary greatly in size depending on how much extra traffic is around to move north.
MWCRV
MWCRVB
MWCRVC
MWCRVX Manifest West Colton, CA Roseville, CA Mon-Sun
A large manifest train that runs from West Colton north to Roseville. On most days a second scheduled train (MWCRVB) departs West Colton about 12 hours after the fist scheduled train (MWCRV). These trains almost always have DPUs on the rear or cut in mid train. When traffic is heavy, a third scheduled train (MWCRVC) and/or an extra sections (MWCRVX) can be run. These can vary greatly in size depending on how much extra traffic is around to move north.
OLBTN Ore Long Beach, CA Trona, CA ---
The empty Soda Ash train from Long Beach to Trona tends to run 1 to 4 times a week. This train can run on either the Saugus Line or the Palmdale Cutoff. It is hard to predict which it will use. It does not tend to hold to a real tight schedule.
OTNLB Ore Trona, CA Long Beach, CA ---
The loaded Soda Ash train from Trona to Long Beach tends to run 1 to 4 times a week. It does not tend to hold to a real tight schedule.
RVUVU Rock Train Vulcan, CA Vulcan, CA Mon-Sun
The Vulcan Rock Train originates at the Vulcan pit, between Palmdale and Wash sidings. It runs north/west to Palmdale Jct. where it take the Saugus Line to Sun Valley. After dumping off its loads at the Vulcan plant in Sun Valley it returns empty back to the Vulcan Pit near Palmdale. The frequency of this train is depended on demand, but it often runs every daily. On Mon to Sat it typically runs at night, with only the last leg of the return trip having any hope of daylight. On Sun it can run a different schedule, departing the Vulcan pit a little after dawn and returning in the early afternoon.
LOP92 Local Mojave, CA West Colton, CA Tue, Thur, Sat
Mojave to West Colton Hauler. Originates in Mojave and runs with whatever cars are needed to West Colton. This train tends to leave Mojave in the early afternoon.
LOQ91 Local West Colton, CA Mojave, CA Wed, Fri, Sun
West Colton to Mojave Hauler. Originates in West Colton and runs with whatever cars are needed to Mojave. This train typically departs West Colton a little after dawn.