The Northwest Railway Museum was founded in 1957. It is currently the largest and most comprehensive railroad museum in Washington State. More than 120,000 people were served by at least one program in 2017.

The Northwest Railway Museum is a Washington non-profit corporation and is recognized by the Internal Revenue Service as a tax exempt public charity under the Internal Revenue Code section 501 (c) 3. The organization is not a private foundation as defined by the Internal Revenue Code section 509.

The Museum is governed by a twelve-member Board of Trustees and is managed by a professional staff.  All public programs, including the interpretive railway, are staffed by volunteers who have undergone rigorous safety and training programs.  The Museum has a membership program to support operations, and to develop and maintain community support.

The Northwest Railway Museum is located in Snoqualmie/North Bend, Washington, easily accessible from the I-90 tourism corridor, located close to many other popular destinations and historic places.

The Snoqualmie Depot is the Museum's most recognizable property, and is listed on the National Register of Historic Places and the King County/City of Snoqualmie Landmarks Register.  It is the centerpiece of the City of Snoqualmie's Historic District. The Museum's railroad tracks are entirely within the Mountains to Sound Greenway, and are adjacent to Snoqualmie Falls and the King County trail system. The tracks pass by the Snoqualmie Falls Generating Station, the world's first underground hydroelectric generating station, which is listed as a National Civil Engineering Landmark by the American Society of Civil Engineers.