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Something to do with the first telegraph message between Montreal & Toronto. Confused by the clues!
I'm a little further along, but not much. The company that transmitted that first message was the "Toronto-Hamilton-Niagara and St. Catharines Electro-Magnetic Telegraph Company".
That still leaves Agios Nikolaos (St. Nicholas) unaccounted for unless Agios somehow relates to Niagara - @blubarb did say that there was some Greek involved