The Radium Express is a tugboat operated by the Northern Transportation Company.The vessel was built in Owen Sound, Ontario, disassembled, and then shipped by rail to Waterways, Alberta, which was then the terminus of the North American railway grid. Like the other vessels in the "Radium Line", she was reassembled in Waterways, on the Clearwater River, a tributary of the Mackenzie, and then proceeded up the Slave River to Fort Smith, and portaged to the upper river, where she could navigate most of the remainder of the extensive Mackenzie River system.