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1. 1 Profil du souterrain. 2 chandelier a cremalliere 3 profil du souterrain avec les ordonnes calculees 4 clou a tete percee 5...

2. All east portal

3. Arching at west end Hoosac Tunnel

4. Boring machine

5. Central shaft at the time of fire, 1867, 583 feet deep

6. Central shaft buildings erected after fire in 1867.

7. Design for arch/entrance of Hoosac Tunnel

8. Design for arches/entrance of Hoosac Tunnel

9. Diagram of excavation and construction. Hoosac Tunnel, on the Troy and Greenfield R.R.

10. Diagrams of excavation and construction. Hoosac Tunnel, on the Troy and Greenfield R.R.

11. East end ; west end ; east end

12. East end, miners going in

13. East end, miners going in

14. East end of Hoosac Tunnel

15. East end of tunnel & roadbed, cart & folks

16. East end; west end; east end

17. The east portal of the Hoosac Tunnel

18. Elevator at west shaft

19. First work on brick arch at west end under B. N. Farren's contract. 1866

20. General diagram of arch for B.N. Farren's contract. Hoosac Tunnel