A pair of ex-Missouri Pacific GP38-2 (QGRY 3539, nee MP 900 and QGRY 3538, nee MP 943) are switching at Oil-Dri, in Laval, on the CPKC Parc Subdivision. QG 503 runs every Sunday morning and serves all the customers between Saint-Martin Junction and QGRY Sainte-Thérèse yard.