| Comment | The Renfrew branch seems a good option if your plan is simply to divert some services that run from Glasgow to Paisley GMS north to the airport instead.
But the difficulty is that this interferes so much with existing Inverclyde and Ayrshire services that it's not particularly worth doing. This is the reason GARL was shelved.
By running a line to the airport via Paisley Canal and looping around the west of Paisley using these old rail beds you're able to bypass the lines that run through PGS entirely, so maintaining higher train frequencies across the network. That said, the Canal option is tricky because some of it is built over in places. It's not an insurmountable problem though, especially if the end benefit is an enhanced network with a looping route serving the airport, Renfrew, Braehead, Govan, QEUH, etc, undisturbed by other existing lines. |
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