Emily Brodman, a research assistant at Stanford, has created a data base of the directors of the Northern Pacific, Missouri Pacific, Mexican Central, Union Pacific, Chicago & Northwestern, Atchison, Topeka and Santa Fe, the Chicago Burlington and Northern, Chicago Burlington and Quincy, the Burlington and Missouri (NE) and the Burlington and Missouri (IA), the Atlantic and Pacific. She traced the networks using a Pajak program to reveal the relationships of directors with multiple roads. It is available on the Spatial History Project website at Stanford.