Wyborn siding (mile 294.1) is located within the town of Hearst and just immediately south of the Hearst Junction wye connecting the Algoma Central to the former National Transcontinental Railway (later Canadian National) line. (This trackage was sold to Ontario Northland by CN in the late 1980s.)

Southbound CN freight 572 rolls past Wyborn siding in Hearst, ON bound for Hawk Junction. July 2015.
At Wyborn, the ACR had a short siding and a long house track, which at many points was used for loading pulpwood. Just south of the siding, the ACR crosses the Mattawishquia River on a three-span deck plate girder bridge.