The Southern Ontario Railway (reporting mark RLHH)[1] is a shortline railroad in the province of Ontario, owned and operated by Genesee & Wyoming Canada Inc., the Canadian subsidiary of Genesee & Wyoming Inc.

[2] On July 23, 2012, Genesee & Wyoming Inc. announced that it intended to purchase RailAmerica in a deal valued at $1.39 billion.

While SOR operated the line, it was supervised by a rail traffic controller in North Bay, Ontario.

The Hydro Spur (Mile 0.0) extends south off of the Hagersville Subdivision and descends southward to Lake Erie at a 1% grade.

Train movements on the spur are governed by CROR Rule 105 and have a maximum authorized speed of 10 mph.