GP-9U Chop Nose Locomotive CP Rail #8633 - Action Red with 6" Stripes and Large Multi-Mark (Used for Road Service) This locomotive is the very best representation of the Canadian GP-9 Chop Nose "N" Scale Locomotives ever brought to the Canadian market. They are as prototypical as plastic injection molding allows. Simply, that means that there may be small variations from the actual locomotive because of the mechanical system of manufacturing a plastic injection mold locomotive.