In 1889, the Oregon Short Line Railway merged with Utah & Northern Railway and 6 other smaller railroads to form the Oregon Short Line and Utah Northern Railway. In 1890 the company finished converting the original Utah & Northern line from narrow gauge to , a process that U&N had started as early as 1885. On October 13, 1893, the OSL&UN went into receivership with the rest of the Union Pacific holdings. The Oregon Short Line Railroad was incorporated in February 1897 and purchased the property of the OSL&UN later that month. On March 15, the OSL took possession of the line and started operating.