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

62. East end ; west end ; east end

63. East end, miners going in

64. East end, miners going in

65. East end of Hoosac Tunnel

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

67. East end; west end; east end

68. East portal

69. The east portal of Hoosac Tunnel

70. The east portal of the Hoosac Tunnel

71. Elevator at west shaft

72. Entrance to tunnel west end

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

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

75. Hoosac Mountain - section on line of tunnel showing condition of work 1st January 1869

76. Hoosac Tunnel

77. Hoosac Tunnel. West shaft buildings

78. Hoosac Tunnel and surroundings

79. Hoosac Tunnel and surroundings

80. Hoosac Tunnel and surroundings