Theodore Judah was an engineer who

Was a prominent personality in the primary promotion, establishment, and purpose the construction of the First Transcontinental Railroad, is the right answer.

Explanation:

Theodore Judah was a prominent personality in the primary promotion, establishment, and purposed the construction of the First Transcontinental Railroad. He was the one who contributed to designing the layout for the Transcontinental railroad as well as accumulating money and requesting the government for support.

Was the father of the Central Pacific Railroad