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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.
SF tunnel work is underway! For more information click 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: July 31, 2018.
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.
October 13 to October 19, Caltrain will perform work in the four tunnels in San Francisco. Crews will perform survey, grout and drilling work in the tunnels. Crews will also perform potholing work outside of the tunnels. Weekend work will be around the clock from Friday evening to Monday morning. Weekday work will be from 8 p.m. to 5 a.m. For more information on the tunnel work, visit www.calmod.org/SFTunnels. 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 San Francisco, please visit our Resources page.
No construction work anticipated.
For more additional information about construction in Brisbane, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to install foundations at the Traction Power Substation Facility and install conduit, and during the night to relocate signal cables, install equipment on poles and install foundations. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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.
October 13 through October 19, Caltrain will be working during the day to install conduit, and during the night to relocate signal cables, install equipment on poles and install foundations. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in San Bruno, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and install conduit, and during the night to install foundations, relocate signal cables and to install equipment on poles. 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Millbrae, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities, install foundations and install conduit, and during the night to install foundations and relocate signal cables. 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 Burlingame 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Burlingame, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and install foundations, and during the night to install foundations and relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 San Mateo 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in San Mateo, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and install foundations, and during the night to install foundations and relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Belmont, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and during the night to relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in San Carlos, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities, and during the night to locate underground utilities and relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Redwood City, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities, and during the night to locate underground utilities and relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 San Mateo County 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 Unincorporated San Mateo County, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities, and during the night to locate underground utilities and relocate signal cables. Day work hours will be from 7 a.m. to 7 p.m. Night work hours will be 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Atherton, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and prune and remove trees along the project route, and during the night to locate underground utilities. Day work hours will be 7 a.m. to 7 p.m. Night work hours will be 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Menlo Park, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and prune and remove trees along the project route, and during the night to locate underground utilities. Day work hours will be 7 a.m. to 7 p.m. Night work hours will be 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Palo Alto, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and prune and remove trees along the project route, and during the night to locate underground utilities. Day work hours will be 7 a.m. to 7 p.m. Night work hours will be 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 Mountain View 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Mountainview, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and prune and remove trees along the project route, and during the night to locate underground utilities. Day work hours will be 7 a.m. to 7 p.m. Night work hours will be 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 Sunnyvale 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Sunnyvale, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities, and at night to locate underground utilities and relocate signal cables. Day work hours will be 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 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in Santa Clara, please visit our Resources page.
October 13 through October 19, Caltrain will be working during the day to locate underground utilities and install a ductbank and manholes at the Traction Power Substation facility, and at night to locate underground utilities and relocate signal cables. 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 Jose 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 the project hotline at 650-399-9659 or toll-free at 855-463-4373.
For more additional information about construction in San Jose, please visit our Resources page.
For more additional information about construction, 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.
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