The Cornwall Swing was a local job that worked between St. Luc Yard and Cornwall, ON. The woodchip cars will be for the two paper mills and the tanks cars for the paper mills or the CIL chemical plant in Cornwall. On Sundays the swing would take passenger units from St. Luc to Dorion where they would be left for the Monday morning inbound commuter trains. Today there is only one F unit but some days there could be as many as four.