Canadian National Railways
Canadian National (CN), Canada's largest railway, was referred to as "Canadian National Railways" (CNR) between 1919 and 1960. They purchased special CNR branded pencils from a Canadian manufacturer. I haven't found evidence of which company may have made these pencils and it is possible more than one company made them over time. The "Canadian National System" as some of these pencils are labeled included railways, hotels and other Canadian National infrastructure.
The S-315 is has a purple coloured core. I've seen other versions of the S-315 that have "soft copying" printed on the side. One S-315 below is painted black and the other is painted purple to match its core. I don't have an S-317 but I've seen one online that had "Canadian National System S-317 Medium Copying" printed on the side.
The S-316 appears to be a copying pencil with a standard sized core. I've seen one pencils labeled "Canadian National Railways S-316 Hard."
The S-318 has a soft thick core. Somewhere in the 2B to 4B range.
This pencil has a blue core. I would call it a checking pencil. There is a similar pencil, marked S-321 with a red core (I've seen one that was labelled "Canadian National Railways Made in Bavaria").
Be a CN booster 48-87-450
This is a newer hexagonal pencil. It is likely not made in Canada but earlier versions of this pencil were.