Although the original Port Mann shops have long since disappeared, remnants still exist in some areas, notably the foundations of a few outer buildings beside the Fraser River. Near the main shop was the facility's stock pen, which up until the late 1960's was still in use with farm animals awaiting transit. It is around this area that the oldest rails at Port Mann can be found.

There is a holding track, recently occupied with a string of scrapped lumber cars, near the long-gone stock pen, that is comprised of rail from various manufacturers. At the end of this holding track are the oldest rails, dating between 1898 and 1906, more than a decade before the Canadian Northern built its terminus here on the old Great Northern right-of-way. Most of the rails in this section were made in 1906 by Algoma Steel, a Canadian company, some of which are marked GTR (likely signifying Grand Trunk Railway, a predecessor line of Canadian National). The oldest rails are American: Illinois Steel Co. (1898), Carnegie Steel Co. Ltd. (1899), and Camel LS Steel Co., Buffalo (1902 and 1906).

The track lies very close to where BNSF trains make their entrance to Port Mann. (Whether these old American rails were once part of the Great Northern's system in the Fraser Valley will never be known.)