A fifth unit, numbered 1604, was purchased in 1971 from the Burlington Northern Railroad, a piece of surplus Great Northern Railway stock from the 1970 merger that formed the Burlington Northern.
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John Marshall Budd was chairman and chief executive officer of Burlington Northern Railroad from 1970 to 1971, chairman from 1971 to 1972, and a director from 1970 to 1977.
The last train order known to have been issued using Morse code was copied at Whitehall, Montana, on May 6, 1982, on the Burlington Northern Railroad.