Extensive improvements at the Park Falls Lbr. Co. yards in Rice Lake in September 1920 included construction of an extensive monorail system to carry logs to storage areas and the mill. Heavy concrete bases had been laid during the summer, and carpenters under Cyrille Mercer began erecting huge support pillars made from 12 x 12 western pine timbers, 42 feet high, for trackage consisting of a 15-inch I-beam monorail designed to carry an electric engine weighing about 8 tons and able to pick up a fourth of a carload of logs. The system ran from the big mill, at the present-day Johnson Truck Bodies site, to the little mill, where the old UBC Lumber later stood, and also crossed Main Street to the west and south side where finished lumber was stacked. It remained in use until the early 1930s, when the Depression made the mill unprofitable as hardwoods became scarce. After the lumber complex was destroyed by fire in 1934, William Stein bought the land for back taxes and Stein Steel became the owner. After World War II, the monorail was dismantled, and Tom McGiffin recalled that his father, Francis, operated a caterpillar in 1946 that knocked down and buried most of the pillars, leaving only those still visible today.