Sign: First Iron Bridge Built by P&RR Company. Designed by Richard B. Osborn, Chief Engineer. Erected Mainline below, Flat Rock Tunnel in 1845. Removed in 1901.
name: label: Collection Creator
content: Missionary Catechists of Divine Providence.
label: Collection Creator
content: Massachusetts Institute of Technology (MIT) Civil Engineering Department
label: Collection Creator
content: Underwood and Underwood
setName: label: See more items in
content: Division of Work and Industry Lantern Slide Collection
label: See more items in
content: Division of Work and Industry Lantern Slide Collection / Series 3: Chemical Processing, undated / 3.5: Massachusetts Institute of Technology (MIT) Collection 52, 1-20
unitdate: label: Date
content: undated
container: label: Container
content: Box 98, Item 12
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Photographs