150414_nyt_bluebird_939.jpg | Kevin D. Liles Photography

The propane delivery system, known as the fuel rail, sits in the engine of a school bus along the assembly line at the Blue Bird are the company's manufacturing plant in Fort Valley, Ga. This photo was taken on Tuesday, April 14, 2015. Photo by Kevin Liles for The New York Times

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Copyright: Kevin Liles
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The propane delivery system, known as the fuel rail, sits in the engine of a school bus along the assembly line at the Blue Bird are the company's manufacturing plant in Fort Valley, Ga. This photo was taken on Tuesday, April 14, 2015. Photo by Kevin Liles for The New York Times