Most likely some sort of SW.
CP yard slug 1015, now owned by Respondek and at their Granite City IL facility.
Recently acquired by Respondek Rail
CP slug 1015 sits at America's Central Port in Granite Cy IL. Built by GMD as an SW900 and converted to a slug by CP in 1993. CP sold it to Respondek in Sept 2013. It's one of several 'new' units picked up by Respondek over the last few months. We'll have to see what they do with it.
CP 1015