(d)3. At-Grade Station Alternative
and Diridon Program
Jessica Zenk, Deputy Director
Ramses Madou, Division Manager
Dept. of Transportation
Transportation and Environment Committee
June 2, 2025
Goals
The Passenger Experience:
A connected, multi-modal and
passenger-friendly station
2 Safe Transit Operators
& Operations:
Providing sufficient capacity,
facilitating safe, integrated and
reliable transit operations
Partners& Key Stakeholders:
Achieving strategic aims and
optimizing benefits for Partners
and key stakeholders
The Surrounding Community:
An anchor for economic &
community development
The Station Building:
A sustainable, future-proof and resilient station
Visioning and Alternatives Development
Recommend
Alternatives (2)
Refine
Alternatives (3)
Develop
Alternatives (3)
Assess
Station
Components Recommended
Alternative (1)
2024 May 2025
3 Constructability Analysis Key Findings
Considerations At-Grade Elevated
7 – 10 Years 10 – 12 Years Construction Period
& Rail Service Impacts
Cost ($2023) $3B-$6B $5B-$10B
Significant encroachments
outside existing corridor
Modest encroachments outside
existing corridor Existing Rail Corridor
FATAL FLAWS
Loses access to CEMOF during
construction and permanently
Maintains access to CEMOF Caltrain Maintenance Facility (CEMOF)
4 Constructability Analysis Key Findings
5 Considerations At-Grade Elevated
Preserves depot and
façade of Annex
Preserves depot
Historic Building and façade of Annex
Encroaches and may
require relocation
Does not encroach
PG&E Facility (Buffer TBD)
Rebuild road Not impacted by station/track construction San Carlos Bridge (Bridge replacement needed)
Rail above road
(Land use impact)
Grade separation road below rail
Auzerais Rail Crossing (Land use / street circulation impact) Road closure
(Street circulation impact)
Road closure
W. Virginia Rail Crossing (Street circulation impact)
Community Engagement Recap
At-Grade
Pros
• Improved station experience
• Appealing reuse of historic station
• Lower costs
• Lower construction impacts
Cons
• Property impacts at Auzerais,
West Virginia, and Stockton
• Quality access across tracks
Elevated
Pros
Cons
• Improved station experience
• Improved local connections for
people walking, biking, and rolling, as
well as for emergency vehicles
• Neighborhood reconnected
• Visual impacts of elevated tracks
• Concerns about maintenance and
programming for space under
elevated tracks
6 Grade Crossings Overview
West
Virginia
Daily car
crossings
~650
Auzerais
7 Daily car
crossings
~8,600
Staff Recommendation
Approve:
• Recommended At-Grade Station Alternative and
• Diridon Program of Projects for Environmental Review
8 At Grade Station Project Elements
9 Plazas
Historic Depot Julian St Park Ave San Carlos
Crossing Improvements:
• Julian Street
• Santa Clara Street
• Stockton Avenue
• W Taylor Street
• Stockton Avenue
• San Fernando Street
• N Montgomery Street
Tracks and Platforms
(At Street-Level) Auzerais Ave The Alameda
Bus/Pick up &
Drop Off
VTA LRT
Concourse
(Below Street-Level)
BART
Headhouse and
Connection
Diridon Program of Projects
1 2
3 6
5 4
10 Julian St Park Ave San Carlos Auzerais Ave The Alameda Program Elements
1. At-Grade Station Alternative
2. San Carlos Auto Bridge
Replacement
3. Ped and Bike Undercrossing W Virginia
(incl. Bird/Fuller improvements)
4. Full Grade Separation Auzerais
5. Narrow Park Avenue
6. Reconfigure Stockton/Alameda
7. Noise / Sound Barriers (location TBD)
Next Steps
11 • Partner agencies actions: Recommended station design alternative and program of projects for environmental review
• Select and award environmental consulting contract (Caltrain procurement)
• Additional environmental technical work: - Follow-up community engagement - Construction impact strategies/phasing - Project delivery options
- Project definition
Discussion
12 Jessica Zenk, Deputy Director
Ramses Madou, Division Manager
Dept. of Transportation
Transportation and Environment Committee
June 2, 2025