SP Fiber Technologies is a manufacturer of newsprint and packaging papers and is served by the Portland & Western Railroad on former SP track. They convert used paper into these products using mechanical refiners rather than chemicals. During the tour you will walk through the mill, viewing the warehouse full of bales of recycled paper, the separation of paper from plastic and other unwanted materials, and the high horsepower refiners that reduce the paper back to individual cellulose fibers before being run through a paper making machine, and made into paper again for reuse. This mill is the very definition of recycling in practice. A very interesting industrial tour. Extensive walking and stairs on concrete floors and some gravel roadways.