Network Rail say PCI will improve capacity and allow for increased services between Glasgow and Ayrshire, Renfrewshire and Inverclyde.

The Paisley corridor, which is an important route for commuters and freight traffic and had a state of the art signalling system installed over the last 12 months, suffered severe disruption this winter. The final stretch of the line from Arkleston to Gilmour Street has been upgraded to four track for even greater flexibility, rail bosses say.