When it was built between 1951 and 1954, the QNS&L connected the port of Sept-Îles on the north shore of the
St. Lawrence River with the northern terminus at IOC's mining community of
Schefferville, Quebec, a distance of . In 1958, the Wabush ore body near Labrador City was opened by IOC and the
Wabush Mining Company. QNS&L built a line to serve these mines, running west from the Sept-Îles-Schefferville main line at
Emeril Junction, Labrador, to
Carol Lake, Labrador, near
Wabush. Service on this branch began in 1960. At the same time, Wabush Mining Company built the relatively short
Wabush Lake Railway from its mines at Labrador City to the QNS&L connection at Wabush. QNS&L hauls its own traffic from Carol Lake to IOC port facilities at Sept-Îles. QNSX also hauls Wabush Lake Railway traffic from the interchange at Wabush to
Arnaud Jct., Quebec, near Sept-Îles, where it interchanges to the
Arnaud Railway, which then completes the journey around Sept-Îles Harbour to Wabush Mining Co. port facilities at
Pointe Noire, Quebec. In the 1980s, the Schefferville mining operations were closed in favour of iron ore deposits located further to the south near Wabush, and most residents relocated to Labrador City. QNS&L maintained subsidized passenger and freight service for local
First Nations communities along this portion of its system, known as the Menihek Subdivision, until December 1, 2005, when it sold the Emeril Junction-Schefferville rail line to
Tshiuetin Rail Transportation (TSH) for the sum of $1 CAD. QNS&L still provides freight services, transporting employee automobiles, various bulk mine materials, large equipment, and everyday supplies for Labrador City and the various maintenance of way camps. This railway, along with the TSH line,
Chemin de fer Arnaud (ARND),
Wabush Lake Railway (WABL), and
Bloom Lake Railway (BLRC), form an isolated railway network, as it does not interchange with any other rail lines on the North American network. ==Incidents==