Stony Point and former Mornington and Altona lines c.1983

["FRISCÉ Theatre Co. (Bryan Cullis)" <rabonzo@primus.com.au>]

I have an old Melway (c.1983) that in the back public transport pages the
VicRail map (and the actual maps themselves) state that the Stony Point,
Mornington and Altona lines were "subject to closure" (with the Mornington
and Stony Point lines to close from Baxter on).  With the exception of the
Mornington line, what was it that saved these apparently ill-fated lines and
involved in not only keeping the Altona line open but extending it to
connect with the Werribee line?

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