Built by Baldwin Locomotive Works in March 1928, this 2-6-6-2 locomotive was originally delivered to the Mud Bay Logging Company as number 8 and used in logging operations around Olympia, Washington. It has changed very little since it was built, apart from an addition to its oil bunker. In 1941, Weyerhaeuser purchased the locomotive for $23,500 for use in its Klamath Falls operations, where it was renumbered 6. It remained active until 1960, providing steam for the tracklayer used to build and remove logging spurs. It was the last steam locomotive used by Weyerhaeuser. After retiring in 1960, the engine was displayed at Weyerhaeuser's Klamath Falls Mill from 1962 to 1965, when it was donated to the Northwest Railway Museum. The locomotive has operated at the Northwest Railway Museum. Mud Bay Logging Company was a logging operation in Thurston County, Washington. Established in 1889 by Mark Braham as Western Washington Logging Company, it took the name Mud Bay Logging Company in 1910 and was dissolved in 1941. Weyerhaeuser Timber Company was founded by Frederick Weyerhaeuser in 1900. Through a deal with railroad executive James J. Hill, the company acquired 900,000 acres in Washington State at $6 an acre. Within three years it had built its first sawmill in Everett, and by the end of the 1910s it had 20 operating mills, including one in Snoqualmie. Over time, the company expanded from timberlands and sawmills into a wide range of lumber and paper products and became one of the world's largest private landowners.