Near view of central shaft building, eng'rs at work.

Hawkins' well--no. 4.

Hawkins' well--no. 4.

Compressor building and dump.

Machine shop.

Blacksmith shop, &c., east end.

Blacksmith shop, &c., east end.

East end--miners going in.

East end--miners going in.

East end--near view.

West entrance of arch looking out.

West entrance of arch.

West entrance of arch.

View from Rock Arbor--looking down str.

West portal--showing archway.

West portal--entrance.

West portal--entrance.

Fearful bridge.

Workers at mouth of tunnel.

Hoosac Tunnel--interior view.

Hoosac Tunnel--interior view, showing drill carriage and pipes.

The "N.C.Munson," first engine through Hoosac tunnel, February 9th, 1875.

Deerfield river, looking up.

Portal.

Buildings and tracks near the tunnel.

View of construction.

View of construction.

Hoosac Tunnel, Mass.

Men and children posed at the blacksmith's shop at the east end of the tunnel.

Deerfield valley, looking north.