Tri Delta Transit


Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency 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. Tri Delta Transit local buses connect to the BART rapid transit system at Pittsburg/Bay Point and Concord. Tri Delta Transit buses also connect with County Connection bus service, WestCAT bus service, Delta Breeze bus service and Amtrak at shared bus stops.

Overview of fixed-route service

Tri Delta Transit operates in eastern Contra Costa County and has stops in Antioch, Oakley, Brentwood, Byron, Discovery Bay, Bay Point, Pittsburg, Martinez, and Concord. Tri Delta Transit operates local and express routes on weekdays, local routes on weekends/holidays, and shuttle service to San Francisco 49ers home games.
Major transfer points for the majority of Tri Delta Transit's routes include:
Fleet NumberBuild
date		ManufacturerModelEngineTransmissionNotes
0992-0999GilligBRT 40'
Cummins ISLAllison B400R2009 models
1375-13992012GilligBRT 40'Cummins ISL9Allison B400R2013 models
1680-16992016GilligBRT 40'Cummins ISL9Allison B400RReplaced 2001 Gillig Phantoms
1893-18972018GilligBRT 40'Cummins L9Voith D864.6Delivered in June 2018
1898-18992018Proterra, Inc.Catalyst BE40Battery electric bus
1891-18922018BYD AutoK9Battery electric bus