When Burlington Northern first built a line into the Powder River Basin in the early 1972s, it was just a single track with some sidings. However, with coal mines rapidly expanding, BN started a second main in 1976. The line was largely two track (with single track sections in the 1980s). A third main (10 miles) was added over Logan Hill in 1986. Today, the entire 127-mile sub is (at least) triple track, as seen here with this three train meet south of Bill.
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