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Idea to make a second line that branches from Frankston to service people from way down in Rosebud, since Hastings and Bittern get their own connections.
To go full retard you can construct a bridge between Portsea and Point Lonsdale, have stations at Point Lonsdale, Ocean Grove. Barwon Heads, Armstrong Creek, then connect at Marshall for a complete Melbourne-Geelong-Frankston loop.