From here:

As of 2019, IOC's Carol Lake mine near Labrador City, Labrador utilizes a small fleet of GMD SW1200MG electric locomotives to haul raw ore from the mine to a processing plant. The short electrified railway is the last remaining electrified cargo railway in Canada.

The cargo trains are unmanned and fully automated, advancing block by block based on the condition of the block of track ahead. The motive power is SW1200 MG single units, each having a single phase AC motor driving the standard EMD traction generator and traction motors. A horn blows every few seconds as a constant warning that the trains are unmanned.

(Map source, Photo source)

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