She was originally operated by Weyerhaeuser Steamship Co.
for the US government (1945-49ish) sold to Victory Carriers (1949-69) and at the time of this photo (1956) she was running for States Marine Lines, so she must have been chartered from Victory Carriers...a common practice to distribute military cargo contracts.

When in Vietnam in 1966, these ships under the Victory Carriers flag pulled into Danang, they caused a little concern with some U.S. Navy personnel, not understanding the meaning of the red VC flag flown by the ship. I had to educated them, typical Navy.

Interesting deck cargo (railcars). I had a look into the archives:
Hull: No. 153 of Maritime Commission; Name: SS Coeur d'Alene Victory; Type: VC2-S-AP3
Keel laid: November 12, 1944; Launched: December 15, 1944.
Ship was christened by Mrs. J. D. Wofford, mother of James Wofford Jr., the first casualty of the City of Coeur D'Alene in WW II. James Wofford Jr. was a member of the 148th field artillery and was killed in a Japanese air attack on Darwin, Australia, soon after the war started. (Source The Spokesman-Revies).
COEUR D'ALENE VICTORY war in the war zone during the Korean War. (Source: List of Navy and Marine Corps Awards re. Merchant Ships Used in the Korean War 1956);
Source: The Spokesman-Review, dated 23.8.1944.
Delivered: January 12, 1945
Ship named for City of Coeur d'Alene, Idaho
Shipyard was Oregon Shipbuilding Company, Portland Oregon USA
Ship first owned by US-Govt., Portland Oregon USA
sold/transferred 1949 to Victory Carriers Inc., New York, USA
(was one of the many companies that got its start after World War II using surplus wartime cargo ships (Victory ships, hence the name). The owners flag was white with the red letters VC.
GRT 7.606 tons. DWT 10.750.
Length o.a. 138,8 m, beam 18,9.
1 Steam turbine, 15,5 knots.
Disposal date: BU Kaohsiung beginning 11.3.1969 [Kuang I Enterprises].
Regards Peter

LR-No. 5076937, regards friendship !