Toronto Canada until the early 50's was 25Hz. Niagara power from the late 1890's through to the early 50's was 50Hz to Toronto. Older Canadian radios and very early Canadian television had massive power transformers with lots of copper and iron to accommodate the low frequency. Old timers remember the flicker of incandescent bulbs. (Flourescent lights at 25Hz must have been a nightmare!)
I found an interesting website discussing the recently closed Rankine 25Hz generator: it ran until 2005! Here is the link:
http://192.197.62.35/staff/mcsele/Rankine.html