The Northern Pacific Railway (reporting mark NP) was a transcontinental railroad that operated across the northern tier of the western United States, from Minnesota to the Pacific Northwest. The NP merged with other lines in 1970 to form the Burlington Northern Railroad, which became BNSF Railway in 1996.
Most of this information came from Rapido's web site in support of their release of NP 10000-series souble sheathed box cars...
NP PRE-WAR 1923-1938 (RED ENDS/ROOF)
NP 36″ MONAD 1940-1944 (RED ENDS/ROOF)
NP 36″ MONAD 1945-1950 (BLACK ENDS/ROOF)
NP “MAIN STREET…” 1951-56 (RED ENDS/ROOF)
NP COMPANY SERVICE – 1956-1982