The Northern Pacific Depot at Mandan, North Dakota, undated. Located at Milepost 107.5.

The Northern Pacific Depot at Mandan, North Dakota, undated. Located at Milepost 107.5.

The Northern Pacific Depot at Mandan, North Dakota, undated. Located at Milepost 107.5.

The Northern Pacific Depot at Maltby, Washington, circa 1960. The second depot is pictured, from the George Simonson Collection.

Northern Pacific steam locomotive 645 at Mandan, North Dakota, on June 07, 1916. Number 645 is a class C-23 built by Rogers in 1883. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5011 at Mandan, North Dakota, on September 14, 1946. Number 5011 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5009 at Mandan, North Dakota, on September 15, 1946. Number 5009 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5009 at Mandan, North Dakota, on September 15, 1946. Number 5009 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5007 at Mandan, North Dakota, in September 1946. Number 5007 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5000 on display at Mandan, North Dakota, in 1928. Number 5000 is a class Z-5 built by Alco-Schenectady in 1928. J.M. Fredrickson collection. Number 5000 is on public display in Mandan as the "World's Largest Steam Locomotive". Other Subject Classes: steam locomotive, roster photo