Theodore Judah | |
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 T.D. Judah, c. 1862, age 36 | |
| Born | Theodore Dehone Judah March 4, 1826 Bridgeport, Connecticut, U.S. |
| Died | November 2, 1863 (aged 37) New York City, U.S. |
| Education | Rensselaer Institute in 1837 |
| Occupation | Civil engineer |
| Employer | Central Pacific Railroad |
| Known for | railroad pioneer |
| Title | Chief Engineer, CPRR |
| Spouse | Anna Pierce Judah |
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Theodore Dehone Judah (March 4, 1826 – November 2, 1863) was an American civil engineer who was a central figure in the original promotion, establishment, and design of the First transcontinental railroad. He found investors for what became the Central Pacific Railroad (CPRR). As chief engineer, he performed much of the route survey work to determine the best alignment for the railroad over the Sierra Nevada, which was completed six years after his death.