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San Joaquin Regional Transit Adds 6 More GM Hybrid Buses

The San Joaquin Regional Transit District (RTD) rolled out 6 more hybrid buses to its mass transit fleet. The buses, manufactured by Gillig, are powered by General Motors’ diesel-electric hybrid propulsion system.

The 6 buses are the first to be delivered to a hybrid bus purchasing consortium, announced in January, consisting of numerous transit agencies in California and elsewhere. San Joaquin RTD spearheaded the consortium to boost purchasing power and reduce per-vehicle costs through mass ordering. The consortium plans to purchase up to 157 GM hybrid-powered buses, including 50 to San Joaquin RTD. (Earlier post.)

These hybrid buses will help San Joaquin RTD fulfill its commitment to significantly minimize air emissions, which in turn reduces the environmental impact to our region's land and water. They also will help RTD and the other consortium members realize significant fuel cost savings by using GM's diesel-electric hybrid systems.

—Donna Kelsay, RTD’s general manager/CEO

The GM advanced hybrid propulsion technology—which is the basis for the two-mode hybrid powertrain development work undertaken by GM, DaimlerChrysler and BMW for light-duty vehicles—delivers significantly better fuel economy than traditional buses and produce up to 60% fewer oxides of nitrogen emissions and 90% fewer particulate, hydrocarbon and carbon monoxide emissions than the buses they replace.

Other benefits of the buses include reduced maintenance costs resulting from extended brake, engine oil and transmission oil life; providing 50% faster acceleration compared with conventional diesel buses, and operational sound levels approaching that of passenger cars.

Since 2004, more than 475 GM hybrid-powered buses have been delivered to 38 communities in the US and Canada. The estimated annual combined fuel savings for the 475 GM hybrid-powered buses is 700,000 gallons.



Rick and Bob dont know they make these. And pass CARB NOx?

allen Z

At least this is another GM division that is doing better.


This is about 6 years old development, well known to everybody familiar with the field. It is actually Allison transmission with integrated electric motors/generators, and could be added to any engine. Together with D-C Orion system, these two represent probably 90% of total hybrid buses market. Arguably it is the only up to date technology GM is offering.

Diesel buses, even with hybrid transmission, have troubles to meet extremely stringent emission legislation for city buses without NOx aftertreatment devises.


If they would just make these hybrids run on CNG, they would be very clean.

Our transit district runs CNG bus lines
past the college and they are very clean, queit and dependable.

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