Mail Steamship Company and sailed from New York for San Francisco on January 9, 1850 arriving in San Francisco on May 7, 1850. She was used on the San Francisco to Panama City service until the end of 1851. Sold for service in China in 1854. SS Unicorn (1850–1853): Built in 1838, she sailed from New York for California and arrived at San Francisco on December 1, 1849, having been chartered by Pacific Mail Steamship Company, who purchased her in 1850. She operated occasionally between San Francisco and Panama City until April 1853 when she was sold and returned to England via Australia. SS Columbia (1850–1862): Built for the company in 1850 and sailed from New York for San Francisco on October 15, 1850. She was intended for the mail service between San Francisco and Astoria, Oregon, but the amount of business between San Francisco and Panama City caused her to be used in that service occasionally between 1851 and 1854. Sold to Chinese owners in 1862. SS Ecuador (1850–1853): Built for the Pacific Steam Navigation Company in 1845 for the Callao – Guayaquil – Panama City service she made one voyage from Panama City to San Francisco in July–August 1850. In 1850 she was sold to the Pacific Mail Steamship Company, and was wrecked at Coquimbo in 1853. SS Crescent City and SS Empire City (1850–1851): Purchased for New York City to Chagres voyages; sold in 1851 to U.S. Mail Steamship Company. (1850–1851): Built in 1846, she operated between Liverpool and New York until chartered to the Empire City Line and operated from San Francisco to Panama City until October 1850 when she was purchased by the Pacific Mail Steamship Company. She continued operating on that route until July 1851. She was then sold and returned to England via Australia and resumed transatlantic voyages to Canada until chartered by the British government for transporting troops to the Crimea and later India in response to the Indian Mutiny. While on the way to India in 1857 the ship suffered a notable fire, but survived only to be later wrecked in India. SS Northerner (1850–1860): Built in 1847, she arrived in San Francisco on August 15, 1850, and made one voyage to Panama City for the Empire City Line before being sold to the Pacific Mail Steamship Company in December 1850. She was used on the San Francisco to Panama City