Impact of Rail Link on Suburbs within the Hills District

[earthday]

I am a first home buyer, and would like to purchase in the Hills district. I've been told by a friend the on-again-off-again North West rail link (at this stage schedule for completion in 2016), may result in an increase in property prices for certain suburbs such as Carlingford and Castle Hill, but not others such as Baulkham Hills. I have some interest in purchasing in Baulkham Hills, but am concerned if this is one of the suburbs where prices will not increase with the introduction of the rail link.

Any comments/advice on the above, and buying in the Hills generally would be appreciated. FYI I am looking to purchase a 3 bedroom townhouse.

Thanks.