Located just minutes from the US/Canada border, the museum offers a hands-on look at Canadian National's #6218, reportedly the last steam locomotive in Canada to operate in revenue passenger service.  It is in surprisingly good condition considering it's exposed to the elements AND visitors are allowed to climb all over her.  The accompanying caboose is also in good condition and when I visited in July 2008 the interior looked as if it had just returned from the rebuild shop.  The Ridgeway station is here as is the unique B1 station that was located on the Canadian side of the International Railway Bridge.
Canadian National's 4-8-4 'Northern' on display at the museum
Although the museum doesn't have its own website you can find out more here