The history of the oil and natural gas industry in North America is in many ways intertwined with the history of the railroad, which in the mid-19th century became the main means of transcontinental transportation for Americans and Canadians.
As these great railroad systems were constructed across the continent, the companies building them gained ownership of great swaths of land, and, as importantly, obtained ownership of the minerals beneath the land. In the United States, as oil and natural gas began to be discovered across the Midwest and Rocky Mountain states, a good deal of it lay beneath land owned by rail companies like Burlington Northern, Union Pacific and Santa Fe.
These companies all eventually created subsidiaries to manage their oil and gas royalty holdings, and those subsidiaries eventually evolved into some of the country’s largest independent producers: Burlington Resources, Union Pacific Resources and Santa Fe Energy. Those companies are all gone today, having been merged with or acquired by ConocoPhillips, Anadarko Petroleum and Devon Energy, respectively, but their place in history is firmly established.