In all the forums I belong to I would say the number of Canadians active on modelling railroad forums is around one hundred and fifty folk, but this is spread all over - from the Layout Design Sig at Yahoo, Trainboard, Atlas, Digitrax, etc.
I know there are modeller's active on forums from Calgary but not here. At the Atlas forum there is one chap with an incredible N scale layout, I think his handle is SD90. There might actually be two or three at the Atlas forum.