Thanks LFT, that was the Crossrail I meant. If the rail link was just a service from Central Station to Glasgow Airport via Paisley that would limit the number pf passengers who would be prepared to use it. Opening up the line at High Street would mean the possibility of trains from Edinburgh, Stirling, Perth and Aberdeen. For me to be tempted to leave my car at home there would have to be a direct link from Ayrshire.
The Transport Scotland report endorsing the new link assumes that most passengers' final destination is Glasgow city centre and so dismisses Scotland's Crossrail as irrelevant. Does anybody know statistics for GLA passenger origin/destination?