You are looking for MTH 20-2604-1 or 20-2604-3, the VIA Rail F40PH with a "Kool-Aid" theme painted on the sides.
It's a tough search. I have also been looking for these, and in the past two years have only found a single one offered on an online auction site. When these were cataloged in 2005 the actual production numbers must have been small, likely due to a small number of pre-orders from Canadians interested in VIA locomotives with this very "distinctive" paint scheme.