I found this historic photograph from the former Northern Pacific Railroad at my Link page Fallen Flags.Org, which is located to the right of your computer screen at www.rr-fallenflags.org
This photograph was taken on July 7th, 1966 at Cloquet Minnesota, by railfan photographer K.C Henkels on a beautiful and very sunny summer day.
One of the railroads that made up the mega Burlington Northern Railroad merger of March 2nd, 1970, was the Northern Pacific Railroad, which operated from Northern Wisconsin to Montanna.
Although long outdated and discontinued in daily use on most American railroads by the 1960's, the Northern Pacific proudly utilized their old wooden steam era cabooses until the merger with the Great Northern, The Chicago, Burlington & Quincy and the Spokane, Portland & Seatle Railroads in 1970.
After the Burlington Northern began operations upon the 1970 merger, some of the old Northern Pacific and Great Northern wooden steam era cabooses, were used in daily transfer train service by BN out of Minneapolis Minnesota until the late 1970's.
Several of these have been preserved on various tourist railroads and railroad museums.