City and Caltrain present refined concepts for Churchill, Meadow and Charleston grade separations; staff seeks committee feedback

City of Palo Alto staff and Caltrain engineering presented refined conceptual designs on Sept. 16 for grade separations at Churchill Avenue (partial underpass), Meadow Drive and Charleston Road (hybrid and underpass variants) and asked the rail committee for initial feedback before advancing one or more alternatives to 15% design.

Dipan Bhatia, senior engineer with the city's Office of Transportation, and Edgar Torres, Caltrain design oversight, led the technical presentation. Bhatia reminded the committee that council previously selected a partial underpass as the locally preferred alternative at Churchill with a separate bicycle–pedestrian crossing at Seal Avenue; Meadow and Charleston had been advanced as hybrid and underpass options. Staff said the current phase is an initial refinement to reduce property impacts and improve operations before the 15% design phase.

Key technical findings and trade-offs

- Churchill (partial underpass with Seal Avenue bike/ped options): Staff described refinements that could locate most roadway work within the existing right-of-way by providing two northbound lanes split between an Upper and Lower Alma configuration; the proposal seeks to preserve a planting strip and meet fire access needs with a 20-foot lane width where required. Staff said adding a 4½-foot planting buffer between sidewalk and roadway could require relocating utility poles or undergrounding lines. Two Seal Avenue bike/ped ramp concepts were presented: a center ramp with a tunnel under Alma and tracks that would remove on-street parking and could require minor private-property takings (approximately 1.5–2 feet of frontage in sketches shown), and an alternative ramp adjacent to Alma that could require partial acquisitions at two small parcels near Pierce Park.

- Meadow Drive: Caltrain and city staff presented both a bridal/hybrid alternative (raising the track alignment and lowering the roadway modestly) and an underpass option. The hybrid options were described as having little or no private-property takings in initial mappings, while the underpass in staff estimates could require one to four full takings and six to nine partial takings. Staff noted the underpass produced better traffic delay improvements in modeling but could present constructability and truck‑turning issues at ramp intersections that would require design changes.

- Charleston Road: Staff presented a refined underpass concept that removes a previously proposed two‑lane roundabout by adding a direct-access ramp from Alma to Charleston, reducing some property impacts east of Alma. Staff said the underpass options include varying degrees of private-property impacts depending on configuration; the hybrid option showed minimal property takings in current parcel map checks. Staff reported estimates of property‑impact ranges for the underpass variants: roundabout underpass (three full takings and 23–25 partial takings) and underpass with direct-access ramp (one full taking and 21–23 partial takings) in preliminary assessments.

Traffic and multimodal analysis

Caltrain and city consultants said updated traffic counts (May 2025) showed stable or slightly reduced vehicle volumes in many movements since pre‑COVID counts, and staff applied conservative growth assumptions in future-year modeling. The presentation reported that all alternatives improve on existing conditions through 2040; underpass options generally produced lower delays, especially in future-year modeling.

Construction, utilities and right-of-way

Staff emphasized constructability, geotechnical and utilities analyses will affect final footprints. Caltrain staff said discussions about potential temporary encroachments on Caltrain right‑of‑way are ongoing and that any such intrusions remain subject to negotiation; the city and Caltrain plan to continue integrated design and constructability reviews.

Public comments and committee questions centered on bike/ped safety in tunnels, potential student use of Seal Avenue ramps, utility relocations, the number and timing of community meetings, and the need for clear visual materials comparing alternatives. Several speakers urged the city to provide additional meetings at accessible times and better, consistent renderings for all options.

Next steps and schedule

Staff said it will hold community meetings on Sept. 30 to gather public input, synthesize comments and return to the rail committee in November with recommendations about which alternatives to carry into 15% design. Staff estimated 15% design completion in late spring (May–June) of the next year, followed by 35% design through 2026–27. City staff also said constructability workshops and utility investigations are underway and will inform 15% design and property-impact conclusions.

Why this matters: Grade separations are major transport infrastructure projects with implications for traffic flow, neighborhood access, right-of-way and property; the committee's early feedback will shape which concepts proceed into formal design and environmental review.

Sources and attribution: This article quotes and paraphrases remarks made by Dipan Bhatia (City of Palo Alto Office of Transportation), Edgar Torres (Caltrain engineering oversight) and multiple city and committee members during the Sept. 16 rail committee meeting.