The NB Southern yard in Saint John is their main yard and is known as Ponderosa Yard. From here, they interchange with CN in Saint John and send trains to Maine. Irving Forest Products shares the area.
This is the former CP yard and runs the length of Dever Road in west Saint John. On this map, the yard is in the middle just above the words “Dever Rd”.
Note that NB Southern is also currently leasing and operating CN’s Island Yard in Saint John.