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// Workers AI · dad joke modeWhy did Tri Delta Transit go to therapy? It had delta-mas.

From Wikipedia, the free encyclopedia

Tri Delta Transit
ParentEastern Contra Costa Transit Authority
Founded1977 (1977)
Headquarters801 Wilbur Ave, Antioch, California, United States
LocaleEast Contra Costa County, California
Service typebus service, paratransit
Routes13 weekday, 8 weekend[1]
Stopsapproximately 650[1]
Fleet
[1]
Daily ridership
4,500 (weekdays, Q1 2026)[2]
Annual ridership
1,321,000 (2025)[3]
OperatorTransdev[1]
Websitetrideltatransit.com Edit this at Wikidata

Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency (JPA) of the governments of Pittsburg, Antioch, Oakley, Brentwood, and Contra Costa County that provides bus service for the eastern area of Contra Costa County, California, United States.[1] Contra Costa County has four major public bus transportation services, divided geographically: three mostly serve destinations within the county, covering western (WestCAT), central (County Connection), and eastern (Tri Delta Transit) regions, and one (AC Transit) serves Bayside cities along the western edges of Contra Costa and Alameda counties. In 2025, the system had a ridership of 1,321,000, or about 4,500 per weekday as of the first quarter of 2026.

Tri Delta Transit local buses connect to the BART rapid transit system at Antioch, Pittsburg Center, Pittsburg/Bay Point and Concord. In addition, Tri Delta Transit buses connect with Amtrak commuter rail services, including Gold Runner and Capitol Corridor. Within the county, several Tri Delta Transit bus routes connect with County Connection and WestCAT.

History

[edit]

The Eastern Contra Costa Transit Authority (ECCTA) JPA was formed in 1976 by the cities of Antioch, Brentwood, and Pittsburg, along with the County of Contra Costa. When Oakley was incorporated in 1999, the JPA was amended to admit Oakley on April 1, 2001.[4]:1 The Tri Delta Transit name was selected in May 1977 by the marketing committee of the ECCTA.[5]

1977–1995

[edit]

Tri Delta Transit fixed route service began on June 6, 1977, celebrated by an inaugural bus starting from Antioch City Hall (10 a.m.), traveling to Oakley (10:30), Brentwood City Hall (11), Pittsburg, and ending in West Pittsburg (2 p.m.). For the first week, free rides were offered.[6] Initial service was provided for two local routes in Antioch and Pittsburg, which connected with express bus service serving BART.

AC Transit operated the service under contract until 1984, when it was transferred to a private operator,[4]:1 and ECCTA acquired its first buses; prior to that, AC Transit owned the buses it used for Tri Delta Transit.[7] Some of the buses used in 1978 included 29-foot models, shortened from 35-foot buses at the AC Transit shops.[8]

Dial-a-ride on-demand transit services have been provided since January 1979 using contracted private operators such as Community Transit Services (CTS). In 1981, Dial-a-ride was expanded to serve all residents of the rural East County.[7] In 1984, ECCTA consolidated fixed route and on-demand services with a single operator when the contract with AC Transit were terminated; this transition involved ECCTA’s acquisition of seven 35 foot Gillig diesel buses for use in fixed route service.[7] In 1986, Laidlaw Transit, Inc. (later First Transit, now Transdev) replaced CTS for all services and begin operating Tri Delta Transit.[7]

The ECCTA headquarters in Antioch was built in 1987, consolidating administration, operations, and maintenance at a single facility; this involved Tri Delta Transit's acquisition of another six 35 foot Gillig diesel buses for use in fixed route service.[4]:1 In July 1991, the Dial-a-ride service was once again limited to seniors and disabled persons.[7] Brentwood Dimes-a-Ride service (also known as the Brentwood Loop) began as a subsidized route by the City of Brentwood. General passenger fares were 10 cents.

1995–1999

[edit]

On October 5, 1995, It was announced that County Connection proposed merging with Tri Delta Transit, it has been canceled.[9] In July 1997, ECCTA took over the BART Express bus service in East County. The former BART Express buses operated by Laidlaw has a small Tri Delta Transit logo slapped on the sides.[10] In November 1998, Tri Delta Transit announced it has plans for a luxury bus service between Brentwood and Lawrence Livermore Laboratory.[11]

In late-February 1999, Tri Delta Transit has a bus strike due to its contract with Laidlaw was nearing expiration.[12] On September 24, 1999, Tri Delta Transit announced it will launch the Delta Express service in 2000. The agency's board of directors unanimously agreed to spend $2.8 million on purchasing the six "over-the-road" commuter coaches to launch the service.[13]

1999–2001

[edit]

On December 30, 1999, Tri Delta Transit announced it will purchase three new trolley transit buses for the Brentwood Dimes-a-Ride service. These buses resembled San Francisco's historic cable cars.[14] The trolleys were built by Cable Car Classics in Healdsburg, California at a cost of $993,000 and having the squared-off look, and the clanging bells, that make cable cars instantly recognizable. But, unlike the cable cars in San Francisco, they'll be closed-in to protect riders from the elements.[15] The trolley buses began operating on April 2, 2001 in Downtown Brentwood.[16]

The three trolley buses in Brentwood are named "Desire" (which was named for the play by Tennessee Williams), "Barbara" (which is named for Barbara Guise, a former ECCTA board member and former Brentwood mayor) and Delta Dawn. The new Dimes-a-Ride buses replaced the older, 1980s Gillig Phantom buses. The buses originally deliver in time for the CornFest in July 2000.[17] When the new trolley buses were coming to Brentwood, It was announced in late-June 2000 that Tri Delta Transit will start its long-awaited bus service to Lawrence Livermore Laboratory. The new service, called "Delta Express" used six 2000 MCI 102-EL3 motorcoaches instead of the regular, white Gillig transit buses.[18]

On November 29, 2000, Tri Delta Transit purchased two Gillig demonstration buses for $100,000, these buses will be used for the Oakley route. These buses are the 1999 Gillig Low Floor 29' models, which includes 9996 and 9997. The first one was the first Gillig Low Floor 29' ever built, when the second one was a demo for Tri Delta Transit.[19] When the new buses delivered to the agency, Tri Delta Transit began operating its route 383 service to Oakley (known as the Oakley Loop) effective April 1, 2001, the same month as the new trolley buses started operating in Brentwood. Before that, Tri Delta Transit operated a bus route in Oakley in the early 1990s but it didn't do well.[20]

2001–present

[edit]

In June 2002, Tri Delta Transit announced it will start its bus service to Bethel Island and Knightsen effective July 1, 2002. It is called route 381, the first of its kind in those communities.[21] However, due to low ridership, this route was discontinued effective August 17, 2003. On August 18, 2003, Tri Delta Transit announced it started operating its weekday Delta Express bus service to the Dublin/Pleasanton BART station.[22] In 2004, the ECCTA headquarters was expanded to include additional car space and more bus parking.[4]:1 In 2006, Tri Delta Transit aired a 30-second television commercial designed for East County viewers, named "We go everywhere". This ad comes with a Johnny Cash-inspired soundtrack that recites many of the places the agency's buses frequent.[23]

In December 2008, It was announced that Tri Delta Transit will discontinue the Lawrence Livermore Lab route from the Delta Express, leaving Dublin/Pleasanton BART as the only route from the service.[24] In late February 2009, Tri Delta Transit acquired its first Gillig Low Floor BRTs; this purchase of the new Gilligs marked the beginning of a multi-year plan to replace all buses currently in operation.[25] In 2013, Tri Delta Transit announced it will auction off many of its buses that were replaced by the new ones. This included twenty-eight Gillig transit buses, three Dimes-A-Ride trolley buses and one MCI Delta Express motorcoach bus. They possibly also included 2006 Ford E-350 paratransit buses, office equipment and others.[26] After the auction, all of ECCTA's auctioned buses were bought by Zacher's Auto Salvage in Harbor City, California.

In June 2018, Tri Delta Transit announced it purchased two new battery electric buses from Proterra, and an another two from BYD in August 2018. The first two buses can carry up to 38 passengers, when an another two buses can carry up to 32 passengers. The first two buses started operating in July 2018.[27] On June 17, 2019, Tri Delta Transit launched Tri MyRide, a on-demand shuttle service that was originally located in Antioch and Oakley, as well as Pittsburg and Bay Point. The 6-month pilot program is being implemented in partnership with ECCTA and TransLoc.[28] On August 10, 2025, Tri Delta Transit began operating its new, revitalized fixed-route service called "The New TDT Network". They included new 37x numbered routes, which operated both weekdays and weekends such as 370 and 373. Also, they put the Tri MyRide service into the Brentwood area, as well as the expanded Antioch-Oakley area.[29]

Overview of fixed-route service

[edit]
Tri Delta Transit Gillig BRT in Pittsburg.

Tri Delta Transit operates in eastern Contra Costa County and has stops in Antioch, Oakley, Brentwood, Bay Point, Pittsburg, Martinez, and Concord. Tri Delta Transit operates local and express routes on weekdays and local routes on weekends and holidays.

Transfers

[edit]

Intra-system transfer points for the majority of Tri Delta Transit's routes include:

In addition to transfers within Tri Delta Transit and to BART, riders may transfer to neighboring and long-distance public transportation systems at other stations, including:

Route list

[edit]

Tri Delta Transit operates thirteen bus routes on weekdays, serving the cities of Bay Point, Pittsburg, Antioch, Oakley, and Brentwood, with one route each connecting to Concord (201X) and Martinez (200X). Most routes parallel the San Joaquin River, running east and west; routes designated as "express" (200X, 201X) are designed with fewer stops and operate primarily during commute hours with limited mid-day service. Several routes share the same terminal points, but take different paths to provide service to communities both north and south of California State Route 4.[30] For example, 370 and 371 both provide service between the Pittsburg/Bay Point and Antioch BART stations.

On the weekends and holidays, Tri Delta Transit operates eight of the thirteen routes throughout the ECCTA service area including the aforementioned cities with the exceptions of Concord and Martinez. Routes numbered 37x operate all week long, with reduced service frequencies on weekends and holidays.[31]

Tri Delta Transit bus routes[31]
RouteWestbound TerminalEastbound TerminalWeekend serviceNotes / Refs.
200X Martinez station (Amtrak)Pittsburg/Bay Point BART No[32]
201X Concord BART No[33]
360[a] Los Medanos CollegeAntioch High School No[35]
361 Antioch BARTDeer Valley & Dozier Libbey No[36]
362 Blue Goose Park (Oakley Loop) No[37]
370[b] Pittsburg/Bay Point BARTAntioch BART Yes[39]
371[c] Yes[41]
372[d] Los Medanos College Yes[43]
373 Antioch BARTBrentwood Park & Ride Yes[44]
374 Bay PointPittsburg-Bay Point BART Yes[45]
375 Antioch BARTSlatten Ranch Center Yes[46]
376 Kaiser Antioch Medical Center Yes[47]
377 Walmart Supercenter Yes[48]


Discontinued Tri Delta Transit bus routes
RouteWestbound TerminalEastbound TerminalWeekend serviceNotes / Refs.
70 3rd & Marina[e] No[49]
200 Martinez station (Amtrak)Wilbur & Cavallo Rd[f] No[50]
202X Brentwood Park & Ride[g] NoReplaced with Tri MyRide (dial-a-ride) service.[29]
300 Pittsburg/Bay Point BARTBrentwood Park & Ride No[51][52]
300X[h] Antioch BARTBrentwood Park & Ride No[i][53]
379 Antioch BARTAntioch Medical Center No[j][k][55]
380[l] Pittsburg/Bay Point BARTAntioch BART Yes[m][56]
381[n] Pittsburg MarinaLos Medanos College Yes[57]
383[o] Wilbur and Cavallo Rd[f]Blue Goose Park No[58]
384[p] Antioch BARTBrentwood Park & Ride No[59]
385[q] Antioch BARTBrentwood Park & Ride No[60]
386 Brentwood Park & RideDiscovery Bay Park & Ride No[61][62]
387[m][r] Pittsburg/Bay Point BARTAntioch BART No[63]
388[m] Pittsburg/Bay Point BARTAntioch Medical Center Yes[64]
389[s] Pittsburg/Bay Point BART[t] Yes[65]
390[m] Pittsburg/Bay Point BARTAntioch BART No[u][66]
391[v] Pittsburg Center BARTBrentwood Park & Ride Yes[67]
392 Pittsburg/Bay Point BARTBrentwood Park & Ride Yes (no weekdays)[w][68]
393 Mariners Cove Dr & Pacifica AveHillcrest Park & Ride Yes (no weekdays)[w][69]
394 Pittsburg/Bay Point BARTHillcrest Park & Ride Yes (no weekdays)[w][70][71]
395 Antioch BARTThe Streets of Brentwood Yes (no weekdays)[w][72]
709 Pittsburg/Bay Point BARTAntioch BART No[x]
Delta Express Hillcrest Park & RideLawrence Livermore National Laboratory No[75]
Notes
  1. Subset of legacy route 380, truncated at Los Medanos College (western terminus) and Antioch High School (eastern terminus). Limited service, with one trip each in the mornings and afternoons.[34]
  2. Adopts aspects of legacy routes 388 & 390 west of Railroad Ave (Pittsburg), 387 & 390 between Railroad and Loveridge, 380 & 387 between Loveridge and Somersville, 387 between Somersville and G, and 380, 388, and 387 east of G. Runs on Leland west of Somersville, then Sycamore and 18th east of Somersville.[38]
  3. Adopts aspects of legacy routes 380 west of Railroad Ave (Pittsburg) and 388 east of Loveridge. Generally serves neighborhoods north of SR 4.[40]
  4. Largely replicates legacy route 387, with eastern terminus moved to Los Medanos College. Serves neighborhoods within Pittsburg.[42]
  5. Operates loop service in Pittsburg via Buchanan and Harbor
  6. 1 2 Tri Delta Transit headquarters
  7. Operates loop service via Los Medanos College Brentwood Center
  8. Consolidated with 391 and renumbered to 373, which offers more frequent service.[29]
  9. Designed for traditional commute, operating westbound in the mornings and eastbound in the afternoons
  10. Operates during school days for Antioch Unified School District[54]
  11. Renumbered to 361.[29]
  12. Replaced by new route (360).[29]
  13. 1 2 3 4 Partially replaced by new route (370).[29]
  14. Consolidated into new route (372).[29]
  15. Renumbered to 362.[29]
  16. Consolidated into new routes 373 and 375.[29]
  17. Replaced by new routes 373, 375, and 376.[29]
  18. Replaced by new route (372).[29]
  19. Replaced by new route (374).[29]
  20. Operates loop service around via Bay Point
  21. Operates during commute hours
  22. Renumbered to 373.[29]
  23. 1 2 3 4 Operates exclusively on weekends and holidays, no weekday service[54]
  24. "Early Bird Express" operated as a westbound-only route by Tri Delta Transit before regular weekday eBART service starts at 5 a.m.;[73] eliminated starting from June 10, 2024.[74]

References

[edit]
  1. 1 2 3 4 5 "About Us". Tri Delta Transit.
  2. "Transit Ridership Report First Quarter 2026" (PDF). American Public Transportation Association. May 28, 2026. Retrieved June 1, 2026.
  3. "Transit Ridership Report Fourth Quarter 2025" (PDF). American Public Transportation Association. February 20, 2026. Retrieved February 27, 2026.
  4. 1 2 3 4 Short Range Transit Plan 2020 – 2029 (PDF) (Report). Eastern Contra Costa Transit Authority. August 26, 2020.
  5. "East CC Bus Plan Named". Contra Costa Times. May 25, 1977. p. 12. Retrieved March 13, 2025.
  6. "Events Set To Herald Bus Lines". Contra Costa Times. June 5, 1977. p. 54. Retrieved March 13, 2025.
  7. 1 2 3 4 5 "Inside Tri Delta Transit". Eastern Contra Costa Transit Authority. Archived from the original on April 6, 2001.
  8. "East County's Styled Buses". Contra Costa Times. August 24, 1978. p. 13. Retrieved March 13, 2025.
  9. "Merger of 2 Transit Agencies Proposed". Contra Costa Times. October 5, 1995. Retrieved July 13, 2026.
  10. "Tri Delta takes over BART bus service in East County". Contra Costa Times. July 5, 1997. Retrieved July 13, 2026.
  11. "Tri Delta Transit has plan to pamper commuters". Contra Costa Times. November 8, 1998. Retrieved July 13, 2026.
  12. "Tri Delta Transit Contract Approved". Contra Costa Times. February 28, 1999. Retrieved July 13, 2026.
  13. "Tri Delta board OKs buses for new service". Contra Costa Times. September 24, 1999. Retrieved July 13, 2026.
  14. "Trolley-type buses coming to Brentwood". Brentwood News. December 30, 1999. Retrieved July 16, 2026.
  15. "Rubber-tired cable cars on their way to Brentwood". Brentwood News. January 6, 2000. Retrieved July 16, 2026.
  16. "High Praise For New Buses". Brentwood News. April 6, 2001. Retrieved July 16, 2026.
  17. "New buses backed up in testing". Brentwood News. November 24, 2000. Retrieved July 16, 2026.
  18. "Buses to Livermore will roll next week". Ledger Dispatch. June 29, 2000. Retrieved July 16, 2026.
  19. "Tri Delta Gets 2 New Buses For Use on its Oakley Routes". Ledger Dispatch. December 1, 2000. Retrieved July 16, 2026.
  20. "Tri Delta Seeks Ideas on Oakley Route". Ledger Dispatch. January 20, 2001. Retrieved July 16, 2026.
  21. "Bus to Come to Bethel, Knightsen at Last". Brentwood News. Knight Ridder. June 28, 2002. Retrieved July 16, 2026.
  22. "Press Release". Eastern Contra Costa Transit Authority. Archived from the original on October 27, 2003. Retrieved July 16, 2026.
  23. "Tri Delta Transit spot wins top cable ad award". East County Times. Knight Ridder. June 8, 2006. Retrieved July 16, 2026.
  24. "Tri Delta Transit to keep Lawrence Livermore Lab shuttle going". Tri-Valley Hearld. Bay Area News Group. December 22, 2008. Retrieved July 16, 2026.
  25. "New Vehicles, New Look for East County Bus Riders" (PDF). Eastern Contra Costa Transit Authority. March 2, 2009. Archived from the original (PDF) on December 23, 2010. Retrieved July 16, 2026.
  26. "Notice of Auction" (PDF). Eastern Contra Costa Transit Authority. Retrieved July 16, 2026.
  27. "Tri Delta Transit launches electric bus". East Bay Times. Bay Area News Group. July 13, 2018. Retrieved July 16, 2026.
  28. "Tri MyRide — $2 for on-demand shuttle service". East Bay Times. Bay Area News Group. June 18, 2019. Retrieved July 16, 2026.
  29. 1 2 3 4 5 6 7 8 9 10 11 12 13 "Revitalize Tri Delta". Eastern Contra Costa Transit Authority. Retrieved August 31, 2025.
  30. "Local Bus". Tri Delta Transit. Retrieved July 19, 2023.
  31. 1 2 "System Map". Tri Delta Transit. August 2024. Retrieved March 7, 2025.
  32. "200X - Martinez / Pittsburg". Tri Delta Transit. Retrieved August 31, 2025.
  33. "201X - Pittsburg-Bay Point BART / Concord BART". Tri Delta Transit. Retrieved August 31, 2025.
  34. "New TDT Network Route 360" (PDF). Tri Delta Transit. Retrieved September 7, 2025.
  35. "360 - Los Medanos College Pittsburg / Antioch High School". Tri Delta Transit. Retrieved August 31, 2025.
  36. "361 - Antioch BART / Deer Valley & Dozier Libbey". Tri Delta Transit. Retrieved August 31, 2025.
  37. "362 - Blue Goose Park / Oakley Loop". Tri Delta Transit. Retrieved August 31, 2025.
  38. "New TDT Network Route 370" (PDF). Tri Delta Transit. Retrieved September 7, 2025.
  39. "370 - Pittsburg-Bay Point BART / Antioch BART". Tri Delta Transit. Retrieved August 31, 2025.
  40. "New TDT Network Route 371" (PDF). Tri Delta Transit. Retrieved September 7, 2025.
  41. "371 - Antioch BART / Pittsburg-Bay Point BART". Tri Delta Transit. Retrieved August 31, 2025.
  42. "New TDT Network Route 372" (PDF). Tri Delta Transit. Retrieved September 7, 2025.
  43. "372 - Pittsburg-Bay Point BART / Los Medanos Colleg". Tri Delta Transit. Retrieved August 31, 2025.
  44. "373 - Antioch BART / Brentwood Park & Ridee Pittsburg". Tri Delta Transit. Retrieved August 31, 2025.
  45. "374 - Pittsburg-Bay Point BART / Bay Point". Tri Delta Transit. Retrieved August 31, 2025.
  46. "375 - Antioch BART / Slatten Ranch Center". Tri Delta Transit. Retrieved August 31, 2025.
  47. "376 - Antioch BART / Kaiser Antioch Medical Center". Tri Delta Transit. Retrieved August 31, 2025.
  48. "377 - Antioch BART / Walmart Supercenter". Tri Delta Transit. Retrieved August 31, 2025.
  49. "Route 70". Eastern Contra Costa Transit Authority. Archived from the original on March 3, 2001.
  50. "Route 200". Eastern Contra Costa Transit Authority. Archived from the original on May 24, 2001.
  51. "300 Eastbound Express Commuter Service (from BART) - Weekday Service". Tri Delta Transit. Archived from the original on May 25, 2007.
  52. "300 Westbound Express Commuter Service (from BART) - Weekday Service". Tri Delta Transit. Archived from the original on May 25, 2007.
  53. "300X - Brentwood Park & Ride / Antioch BART". Tri Delta Transit. Archived from the original on July 12, 2025.
  54. 1 2 "Holiday Schedule". Tri Delta Transit. Retrieved March 7, 2025.
  55. "379 - Antioch BART / Kaiser Antioch Medical Center". Tri Delta Transit. Archived from the original on July 12, 2025.
  56. "380 - Pittsburg-Bay Point BART / Antioch BART". Tri Delta Transit. Archived from the original on August 4, 2025.
  57. "381 - Pittsburg Marina / Los Medanos College Pittsburg". Tri Delta Transit. Archived from the original on August 4, 2025.
  58. "383 - Blue Goose Park / Antioch BART". Tri Delta Transit. Archived from the original on July 16, 2025.
  59. "384 - Brentwood Park & Ride / Antioch BART". Tri Delta Transit. Archived from the original on August 4, 2025.
  60. "385 - Antioch BART / Brentwood Park & Ride". Tri Delta Transit. Archived from the original on June 18, 2025.
  61. "386 Eastbound". Tri Delta Transit. Archived from the original on May 25, 2007.
  62. "386 Westbound". Tri Delta Transit. Archived from the original on May 25, 2007.
  63. "387 - Antioch BART / Pittsburg-Bay Point BART". Tri Delta Transit. Archived from the original on June 18, 2025.
  64. "388 - Pittsburg-Bay Point BART / Kaiser Antioch Medical Center". Tri Delta Transit. Archived from the original on August 4, 2025.
  65. "389 - Pittsburg-Bay Point BART / Bay Point". Tri Delta Transit. Archived from the original on July 16, 2025.
  66. "390 - Antioch BART / Pittsburg-Bay Point BART". Tri Delta Transit. Archived from the original on June 18, 2025.
  67. "379 - Antioch BART / Kaiser Antioch Medical Center". Tri Delta Transit. Archived from the original on July 12, 2025.
  68. "Route 392". Eastern Contra Costa Transit Authority. Archived from the original on May 31, 2001.
  69. "Route 393". Eastern Contra Costa Transit Authority. Archived from the original on June 1, 2001.
  70. "394 Eastbound". Tri Delta Transit. Archived from the original on May 25, 2007.
  71. "394 Westbound". Tri Delta Transit. Archived from the original on May 25, 2007.
  72. "395 - Streets of Brentwood / Antioch BART". Tri Delta Transit. Archived from the original on June 15, 2025.
  73. "Early Bird Express". Bay Area Rapid Transportation District. August 12, 2024. Retrieved March 7, 2025.
  74. "Early Bird Express chart" (PDF). Bay Area Rapid Transportation District. April 28, 2024. Retrieved March 7, 2025.
  75. "Delta Express". Eastern Contra Costa Transit Authority. Archived from the original on June 2, 2001.
[edit]