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One of Oklahoma’s fastest-growing companies, Mammoth Energy Services, continued to expand in the second quarter, buying up two more companies and securing new contracts throughout the country.

Self-driving vehicles typically are described as a disruptive technology that will make traditional modes of public transportation obsolete, but a recent announcement by Chandler-based Waymo is challenging that narrative.

The most ambitious rail project of California’s future is increasingly dependent on the cooperation of the very railroad that shaped the state’s past — and there are signs their relationship is growing strained.

WASHINGTON — Oil and gas executives have watched wearily in recent years as the relationship between the United States and Russia deteriorated, steadily closing off their ability to drill the vast shale plays underlying Siberia and the deep-water oil fields off Russia’s Arctic coast.

Sacramento has signed a deal with a Silicon Valley firm to use downtown streets as a testing ground for self-driving vehicles that will be monitored by remote “drivers” sitting at computers.

Sen. Charles Schumer (D-N.Y.) called on the Federal Railroad Administration to increase the number of independent inspectors that examine rail bridges.

Self-driving car companies testing in Pennsylvania may have to have a second safety engineer in the passenger seat if they want to comply with new state guidelines.

In a clash of old and new industries, Wisconsin frac sand producers say their business is threatened by a handful of railroads operating under outdated regulations. Wisconsin produces about a third of the nation’s supply of sand used to extract natural gas and oil through a process known as hydraulic fracturing, or “fracking.”

An ordinance prohibiting commercial motor vehicles from traveling in the Odessa, Texas, city limits is beginning to show its effect, as five truckers were found guilty of violating the law July 25.

The creation of a common chassis pool by the port authorities for Georgia and South Carolina will go forward.