Train services through Johnstone were cancelled and homes evacuated on Monday evening after a large fire broke out at a recycling plant.
The blaze began at around 6pm close to the Glasgow-Ayr trainline and was reported by a passing Scotrail driver.
One eyewitness reporting seeing an "absolutely massive" fire at the WRC Recycling plant in Floors Street.
Another bystander Tweeted: "Major fire in Johnstone — recycling plant on fire, people being evacuated from nearby housing."
A spokesman for Strathclyde Fire and Rescue said: "Over 60 firefighters from Johnstone, Paisley, Renfrew and a number of other local stations are currently fighting a well developed fire at a recycling plant in Johnstone.
"The incident has been sectorised and crews are using aerial rescue pumps as water towers to tackle the blaze from above.
"Some local resident have been evacuated from surrounding premises. Strathclyde Fire and Rescue is working in partnership with Strathclyde Police, who are also on the scene."
On Tuesday, the police confirmed a joint investigation had been launched into the cause of the blaze, although it had not been established whether it was suspicious or not.
The company specialises in recycling waste plastic materials.
As a result of the fire all services running through the Renfrewshire town were suspended with replacement buses running between Paisley Gilmour Street and Kilwinning stations.
A spokesman for ScotRail said that although replacement bus services were in operation "journey times will be extended therefore onward connections cannot be maintained".
He added: "It is anticipated that this disruption will continue until end of service."
On Tuesday, ScotRail confirmed the disruption on the line is expected to continue until around 3pm.
The video above shows footage of the fire in Johnstone filmed by an STV viewer. It contains background sound only,
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