In the GTA (greater Toronto area) there is a network of commuter trains and buses serving suburbs and outlying rural communities, so if you were planning to stay within 50 miles of the city, you could probably adjust your route to parallel or repeatedly intersect with some of the rail or bus routes, so you would always be within manageable walking distance of a station. I took the train out several stops last summer and biked home, for a total bike ride of about 80 km, and my back-up plan was that if I had a problem coming home, I could always hop on the train at a midway point. This train allows bikes inside except during rush hour. I have a folding bike and I believe the buses would allow me to stow it underneath. Worst case scenario, I lock my bike at a station and get it later.