Days before San Bernardino officials were set to ink a deal for cleaner trucks at a local rail yard, the trucking company partnering on the project has pulled out of the project. San Bernardino Associated Governments officials learned this week that J.B. Hunt Transportation was postponing the planned retrofit of 262 of the company's trucks from diesel engines to natural gas. "This was based on business priorities," said Michelle Kirkhoff, director of air quality programs for SANBAG. The project, to develop trucks that run on natural gas as opposed to diesel fuel, was funded by $19.2 million in state and...