150414_nyt_bluebird_895.jpg | Kevin D. Liles Photography

The engine of a propane-powered school bus sits in its chassis 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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Filename: 150414_nyt_bluebird_895.jpg
Copyright: Kevin Liles
Image Size: 5358x3572 / 2.1MB; new york times editorial newspaper georgia buses propane school bluebird blue bird fuel bus
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The engine of a propane-powered school bus sits in its chassis 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