One of the feature attractions proposed for the Toronto Railway Heritage Centre at the John Street Roundhouse is a permanent operating miniature railway running through Roundhouse Park. While the track plan is still being finalized, an extensive operation is planned to bring animation and live steam to the museum site. Children and adults have always been fascinated by miniature trains, especially if they're large enough to ride on.

For the past several years, a temporary miniature railway has been one of the most popular features of the annual Doors Open event held at the Roundhouse during the last weekend in May. Toronto Railway Historical Association volunteers install track in an area near the turntable and visitors are able to ride the trains back and forth. This has proven to be one of the most popular and family friendly attractions at Doors Open.