Just came across a CN switch list from June 14, 1978 from Portage la Prairie. It lists some grain boxcars to be lifted from two of Portage's elevators:
Pool B Track RG37 East End
U.G.G. Track RG54 East End
Car numbers unreadable, but there were four cars to lift.
All eight cars were billed to Thunder Bay, Ontario
Pool B, later destroyed by fire, was a unique elevator because it was served by both CN and CP.