The snowplow looks to be the Bros "Sno Flyr" built in 1949 by the William Bros(not brothers) Machinery Co of Minneapolis. It was built as a joint venture between the NP, UP and CB&Q. Numbered NP/UP/CB&Q 50, the UP and CB&Q ultimately lost interest in the project so it became NP 50. This plow became BN 972560.
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