It already takes 48 minutes to get home ... 
Either get rid of Aircraft, or don't build William's Landing.
Bad name, too. Prefer Point Cook.
Fortunately Williams Landing is only the name of the housing estate being built. The government has a history of naming station after the suburb (Marshall for example) so we still might get it called Point Cook. As the average person where 'Williams Landing' and they probably won't have a clue - to me it sounds like a small town in the upper reaches of the Yarra Valley. Point Cook at least sounds a bit seaside.
Well i'm sure that will lower that track speed along that line for that section.
Well, my train yesterday morning had no trouble going through Werribee, Aircraft and Laverton at 130km/h. Oh wait - you wanted trains to
stop there - then it will drive up times a bit. As long as they lay the curves out properly then high speed running won't be a problem.
IIRC there are some plans to close Aircraft when a Point Cook station opens. The current stations in Laverton are only a few hunred metres apart.