Theodore Tuttle Woodruff (April 8, 1811 – May 2, 1892) was an American inventor who was an early developer of sleeping cars.

Born in New York State, Woodruff became a wagon maker at a young age before working on railroad cars in Massachusetts.

Woodruff & Company, with Carnegie as one of its investors, the cars were adopted by the Pennsylvania Railroad for its Philadelphia-Pittsburgh Route.

[2] By the end of 1858, the Woodruff sleeping car was in service by eight midwestern railroads including the Michigan Central.

[4] When the Central Transportation Company (CTC) was established in 1862, Woodruff became its principal stockholder while his older brother, Jonah (1809-1876), became its manager.

[2] In early 1889, the CTC was purchased by Pullman not long after it joined the Union Palace Car Company in 1888.