Bangor and Katahdin Iron Works Railway

One of the small locomotives  raytownmaine.info

  Katahdin Iron Works is a Historical Site located in Piscataquis County near Brownville Junction.  As its name implies the township was formed to mine, smelt and make iron.
  In 1843 a formation of Limonite Gossan, a type of iron sulfide ore was found in the area.  Piscataquis Iron Works Company built 18 charcoal kilns to get heat for a 55 foot high rock blast furnace.  About 2000 tons of pig iron were made annually.  There was a company town with houses, a post office and store and the Railway was formed to carry people and goods from the Bangor and Aroostook Railroad yards in Derby (now part of Milo) to the "new" town.
  A total of three locomotives owned by the Railway, number 2 in the above photo was made by Hinkley Locomotive Works.  The Railway also served to haul wood to make charcoal until 1888 when the local forest were depleted, the factory was torn down and parts were sent to Nova Scotia in 1890.
  Today there are parts of the kilns and smelter left to visit and the land can be a pleasure to walk around on.  The KI township is an un-organized township managed by the State and the Northern Woods Organization (a group of lumber interests) and a very small fee is charged to enter parts of the land.  Gulf Hagas and the The Hermitage-a 43 acre grove of trees owned by The Nature Conservancy are located in the KI (a local name for the township).  The Appalachian Trail runs through the township too.  Come and see for yourself, you'll need good shoes and some energy.

Visitors learn about the blast furnace (background).  Maine Dept. of Conservation

Another part-the Railway this time-photos.nerail.com

The complete plant and Railway equipment in 1880. Maine Dept. of Conservation
You can see the rock part of the plants that's still there (#3)