Fitchburg is the third largest city in Worcester County, Massachusetts, United States. Fitchburg is home to Fitchburg State University as well as 17 public and private elementary and high schools. Fitchburg is situated on both the Nashua River and a railroad line. The original Fitchburg Railroad ran through the Hoosac Tunnel, linking Boston and Albany, New York. The tunnel was built using the Burleigh Rock Drill, designed and built in Fitchburg. Fitchburg was a 19th century industrial center. Originally operated by water power, large mills produced machines, tools, clothing, paper, and firearms. The city is noted for its architecture, particularly in the Victorian style, built at the height of its mill town prosperity. As the city is one of two shire towns, the Northern Worcester County Registry of Deeds, established in 1903, and the county jail on Water Street were two county facilities located in Fitchburg.