Construction Overview
Caltrain electrification construction activities will take place between the 4th and King Station in San Francisco to Tamien Station in San Jose. Construction activities include locating underground utilities, testing soil conditions, inspecting signal/communication equipment, pruning/removing trees, and installing foundations in preparation for the installation and operation of the Overhead Contact System that will power the new electric trains. Work will be performed during the day and at night. In order to limit the impact to regular train service, night work will occur between 8 p.m. and 6 a.m. when there are fewer regular service trains.
Learn what CEMOF is and how it’s being updated.
Learn more about the SF tunnel work here.
Learn about staying safe around the new electric overhead wires here.
Construction Map
Click the map below for construction progress along the corridor. Work is organized by four segment areas, with work occurring in segments 2 and 4 followed by work in segments 1 and 3. Current work is indicated by the 
red circles on the map. Last Updated: December 1, 2019.
San Francisco
Brisbane
South S.F.
San Bruno
Millbrae
Burlingame
San Mateo
Belmont
San Carlos
Redwood City
Uninc. San Mateo County
Atherton
Menlo Park
Menlo Park
Palo Alto
Mountain View
Sunnyvale
Santa Clara
Santa Clara
San Jose
Weekly Updates
For the upcoming week, the activities associated with the electrification infrastructure component of the CalMod Program are the following. Sign up for weekly updates here.
For more additional information about construction, please visit our City Specific Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the 22nd St. station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in San Francisco, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Bayshore station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Brisbane, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to install duct bank, rebar and manholes, and perform drainage work at the Traction Power Substation facility in the South San Francisco Caltrain Station parking lot. Caltrain will be working during the night to install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible. During construction motorists and pedestrians may experience intermittent delays while crews move equipment through at-grade crossings.
During work hours at the South San Francisco station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in South San Francisco, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the San Bruno station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in San Bruno, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on poles and install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Millbrae station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Millbrae, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on poles and install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Burlingame and Broadway stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Burlingame, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to clear vegetation at the Paralleling Station facility. Caltrain will be working during the night to install equipment on poles and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible. During construction motorists and pedestrians may experience intermittent delays while crews move equipment through at-grade crossings.
Caltrain electrification crews have permanently closed parking spaces #322-343 and #412-421 in the southern portion of the Hillsdale Station parking lot in order to construct a paralleling station which will help regulate power to the new electric trains. Parking spaces #344-357 and #390-411, also located in the southern portion of the Hillsdale Station parking lot have been temporarily fenced off in order for crews to install a staging area to support this construction. For additional information about the parking closures at Hillsdale station, please visit our Resources page.
During work hours at the San Mateo, Hayward Park and Hillsdale stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287
For more additional information about construction in San Mateo, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Belmont station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Belmont, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the San Carlos station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in San Carlos, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day install duct bank and manholes at the Switching Station facility. Caltrain will be working during the night to install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Redwood City station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Redwood City, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
For more additional information about construction in Unincorporated San Mateo County, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the night to install equipment on the rail. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Atherton station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Atherton, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to prune and remove trees along the project route, install foundations, locate underground utilities and locate underground utilities at the Menlo Park station. Caltrain will be working during the night to locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Menlo Park station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Menlo Park, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to prune and remove trees along the project route, install foundations, locate underground utilities and locate underground utilities at the Palo Alto stations. Caltrain will be working during the night to locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
During work hours at the Palo Alto and California stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Palo Alto, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to prune and remove trees along the project route, install foundations, locate underground utilities and locate underground utilities at the Mountain View stations. Caltrain will be working during the night to locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
Caltrain crews will be extending the existing set-out track approximately 500 feet in order to accommodate on-track equipment required for Caltrain Electrification. The current set-out track is between Farley Street and South Shoreline Boulevard in Mountain View. Construction will require a staging area for foundation installation, pole installation, construction material and pole delivery and storage as well as for loading and unloading of train cars. Staging is expected to begin in October 2019 with construction occurring over an 8-12-month period. To learn more about staging area construction activities, please visit our Resources page.
During work hours at the Mountain View and San Antonio stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Mountain View, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to prune and remove trees along the project route, install foundations, locate underground utilities and install duct bank and manholes at the Paralleling Station facility. Caltrain will be working during the night to install equipment on poles, locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
Caltrain crews have permanently closed parking spaces #421-436, #452-455, and #458-463 in the northern portion of the Sunnyvale Station parking lot in order to construct a paralleling station which will help regulate power to the new electric trains. Parking spaces #437-441, #456-457, and #464-472, also located in the northern portion of the Sunnyvale Station parking lot, will be temporarily fenced off in order for crews to install a staging area to support this construction. Four (4) ADA parking stalls will be temporarily re-located to the north end of the parking lot adjacent to the northern sidewalk ramp. To learn more about the parking closures, please visit our Resources page.
During work hours at the Sunnyvale and Lawrence stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Sunnyvale, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to locate underground utilities and install conduit. Caltrain will be working during the night to install equipment on poles, locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
Caltrain Electrification crews have begun staging materials and equipment between the Santa Clara Station and the College Park Station in San Jose. Construction staging will occur along the Caltrain right-of-way south of the Santa Clara Station. Caltrain has temporarily closed parking spaces #256-269 and #277-290 at the Santa Clara station for crews to stage equipment. To learn more about staging area construction activities, please visit our Resources page.
During work hours at the Santa Clara station all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more additional information about construction in Santa Clara, please visit our Resources page.
On January 25 through January 31, Caltrain will be working during the day to locate underground utilities, install conduit, install signal equipment, install rebar at the Traction Power Substation facility and perform grading work at the Paralleling Station facility. Caltrain will be working during the night to install equipment on poles, locate underground utilities and install equipment on the rail. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be from 7 p.m. to 6 a.m. We apologize for any inconvenience this may cause and the field team will work as quietly as possible.
On December 18, 2019, crews will begin installing temporary shoring near the CEMOF as part of the facility modifications. Metal sheet piles will be installed in the ground to create a wall for a vehicle maintenance pit. Neighbors should expect some noise. This work will happen during daytime weekday work hours (7:00 a.m. to 5:00 p.m.) and is expected to last four weeks.
Caltrain Electrification crews have begun staging materials and equipment between the Santa Clara Station and the College Park Station in San Jose. Construction staging will occur along the Caltrain right-of-way south of the Santa Clara Station. Caltrain has temporarily closed parking spaces #256-269 and #277-290 at the Santa Clara station for crews to stage equipment. To learn more about staging area construction activities, please visit our Resources page.
During work hours at the Diridon, Tamien and College Park stations all passengers will board and de-board from the same platforms. Please look for the signs to indicate which platform to use. If you have any questions, feel free to call Caltrain Customer Service at 1.800.660.4287.
For more information, please call the dedicated outreach line at 650.508.6499; visit the website at www.calmod.org or email calmod@caltrain.com.
For more additional information about construction in San Jose, please visit our Resources page.
Construction Activities
Tree Pruning/Removal
A vegetation clearance zone (called the electrical safety zone or ESZ) has been established from the centerline of the railway tracks outward to ensure electrical safety. The ESZ generally ranges between 16 feet and 24 feet from the centerline of tracks depending on the location and type of poles required at a given location. Trees within the ESZ will be removed or pruned in order to provide the required clearance. Caltrain will replace all trees removed or pruned more than 25% at a 1:1 or greater ratio.
Tree Pruning/Removal
A vegetation clearance zone (called the electrical safety zone or ESZ) has been established from the centerline of the railway tracks outward to ensure electrical safety. The ESZ generally ranges between 16 feet and 24 feet from the centerline of tracks depending on the location and type of poles required at a given location. Trees within the ESZ will be removed or pruned in order to provide the required clearance. Caltrain will replace all trees removed or pruned more than 25% at a 1:1 or greater ratio.
Potholing
Potholing In order to prepare for installation of pole foundations, crews will conduct potholing at each pole location to confirm conditions and locations of underground utilities. Crews will utilize on-track equipment to dig holes expeditiously and minimize impacts outside of the right of way.
Potholing
Potholing In order to prepare for installation of pole foundations, crews will conduct potholing at each pole location to confirm conditions and locations of underground utilities. Crews will utilize on-track equipment to dig holes expeditiously and minimize impacts outside of the right of way.
Geotech (Soil Testing)
To prepare for construction, crews utilize on and off-track drill rigs to take soil samples along the project area. The soil will be tested for contaminants and to determine suitability for placement of pole foundations. Activities will include drilling, testing of samples and removal and disposal of materials.
Geotech (Soil Testing)
To prepare for construction, crews utilize on and off-track drill rigs to take soil samples along the project area. The soil will be tested for contaminants and to determine suitability for placement of pole foundations. Activities will include drilling, testing of samples and removal and disposal of materials.
Foundation Installation
Crews will install concrete foundations approximately 180' apart.
Foundation Installation
Crews will install concrete foundations approximately 180' apart.
Pole Installation
After the foundations are installed, crews will return at a later date to install the poles that will support the wires. Poles will be between 30-50 feet high, and will be installed using cranes and off-track equipment.
Pole Installation
After the foundations are installed, crews will return at a later date to install the poles that will support the wires. Poles will be between 30-50 feet high, and will be installed using cranes and off-track equipment.
Wire Installation
Crews will string the four wires needed to power the train via on-track equipment. Specialized on-track equipment allows the contractor to install the wires at a quick pace.
Wire Installation
Crews will string the four wires needed to power the train via on-track equipment. Specialized on-track equipment allows the contractor to install the wires at a quick pace.
Traction Power and Substation Info
As part of the project, 10 power substations will be installed between San Francisco and San Jose. Construction of the power substations will take 6-12 months per location.These stations will provide and regulate power to the overall system.
Traction Power and Substation Info
As part of the project, 10 power substations will be installed between San Francisco and San Jose. Construction of the power substations will take 6-12 months per location.These stations will provide and regulate power to the overall system.
Bridge Barriers
All bridges that cross over the electrified rail will be fitted with a protective barrier and a screen system above the electrified lines to a minimum of 10 feet outside of the outermost electrified line. The protective barrier will consist of a solid material composed of existing concrete and a polycarbonate panel, and a wire mesh screen above bridges that have pedestrian walkways. On bridges that do not have a pedestrian walkway a concrete and polycarbonate panel, and wire mesh screen several feet above the traffic lanes is required.
Bridge Barriers
All bridges that cross over the electrified rail will be fitted with a protective barrier and a screen system above the electrified lines to a minimum of 10 feet outside of the outermost electrified line. The protective barrier will consist of a solid material composed of existing concrete and a polycarbonate panel, and a wire mesh screen above bridges that have pedestrian walkways. On bridges that do not have a pedestrian walkway a concrete and polycarbonate panel, and wire mesh screen several feet above the traffic lanes is required.
