Thomas Built Buses to Develop Compressed Natural Gas-Fueled Saf-T-Liner® C2

Company Delivers on Commitment to Robust Line of Alternative-Powered Products

High Point, N.C. – Today Thomas Built Buses announced it will further expand its alternative-powered product offerings with the addition of a compressed natural gas (CNG)-fueled Saf-T-Liner® C2 school bus. The company plans to utilize the Cummins Westport ISB6.7 G, a mid-range 6.7 liter natural gas engine, currently in development and expected to be available in 2015.

Thomas Built’s green vehicle lineup also includes the Saf-T-Liner C2e diesel-electric hybrid, propane-fueled Minotour® and Saf-T-Liner HDX CNG models. A propane-fueled offering of the innovative Thomas Built Saf-T-Liner C2 bus is expected to be available in 2013.

Thomas Built Buses launched its Type D rear-engine Saf-T-Liner HDX school bus with CNG in 1992. Since then, the company has put more than 1,300 HDX CNG buses on the road and has seen demand increase in the last five years. The Thomas Built HDX CNG school bus releases up to 20 percent fewer greenhouse gas emissions than diesel engines.

Thomas Built is expanding its CNG offering in response to increasing customer interest in school buses powered by lower-priced, cleaner and increasingly abundant natural gas.

The ISB6.7 G engine will be based on the Cummins ISB6.7 diesel engine and will use Cummins Westport’s proven, spark-ignited, stoichiometric-cooled exhaust gas recirculation (SEGR) technology. The ISB6.7 G, which is expected to be in production by 2015, will be designed to meet Environmental Protection Agency (EPA) and California Air Resources Board (CARB) regulations in force when it is launched.

About Thomas Built Buses

Founded in 1916, Thomas Built Buses is a leading manufacturer of school buses in North America. Since the first Thomas Built bus rolled off the assembly line, the company has been committed to delivering the smartest and most innovative buses in North America. Learn more at or at

Thomas Built Buses, Inc., headquartered in High Point, N.C., is a subsidiary of Daimler Trucks North America LLC , the largest heavy-duty truck manufacturer in North America and a leading manufacturer of class 4-8 vehicles. Daimler Trucks North America produces and markets commercial vehicles under the Freightliner, Western Star and Thomas Built Buses nameplates. Daimler Trucks North America is a Daimler company.

Cummins Westport Inc. is a joint venture of Cummins Inc. (NYSE:CMI) and Westport Innovations Inc. (NASDAQ: WPRT / TSX: WPT) that designs, engineers and markets spark-ignited natural gas engines for North American commercial transportation applications such as school buses, trucks and transit buses.

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