The Simpson Logging Company Locomotive No 7 and the Peninsular Railway Caboose No 700 are good examples of the kind of specialized railroad equipment used to transport logs from woods to mill. Built in 1924, Locomotive No. 7 represents a relatively late development of the Shay-type locomotive invented in 1879 by Ephraim Shay, a Michigan logger. No 7 is one of many Shay locomotives sold in the Northwest during the early 1920's logging boom. Caboose No 700 was built by the Peninsular Railway Company, a subsidiary of Simpson Logging Company, and is typical of caboose cars used by logging firms throughout the Northwest. The year that Locomotive No 7 was built, 1924, has special significance to the City of Shelton. In that year, construction began on the first of two sawmills which later brought unprecedented growth and stability to the town. Today, the caboose and locomotive serve as vital historical links to an important era in the development of Mason County's timber industry. - NRHP, 12 January 1984