The Berlin Mills Railway operates trackage in Berlin, New Hampshire at the Brown Company paper mill and extends a few miles south to Cascade, NH to serve another Brown Company mill. Two GE 70 Ton locomotives were used to perform switching in the mill. These were later replaced by two ex-Amtrak SW1 locomotives. These smaller locomotives are better able to negotiate the small radius and tight clearances in the mill.

In the late 1970s, the railroad leased 50’ boxcars for paper service and painted them into a light green scheme with white lettering. Some can still be seen today in their original paint. Interchange occurred in Berlin with the Grand Trunk RR and the Boston & Maine RR. In 1989, the

GT was replaced by the St. Lawrence & Atlantic, while the B&M was replaced by the New Hampshire & Vermont shortline. The StL&A took over the mills switching operations in the 1990s, ending the Berlin Mills Railway.