Train services are disrupted between Glasgow Central and stations in Renfrewshire and Ayrshire after a "trespass incident".
Police are understood to be at Milliken Park station in Kilbarchan, Renfrewshire.
Services have been cancelled and passengers asked to wait for replacement bus services.
Alex Gordon, who was travelling between Ayr and Glasgow Central, said: "The train stopped at Kilwinning and we sat there for about 15 minutes before we were told to get off.
"There was a lot of anger early on because there was absolutely no information. It soon became clear that station staff had absolutely no idea what was going on. We were told to sit in the station and wait for a bus to arrive.
"We were later told there has been some kind of tragedy, which is awful for all concerned."
Another traveller, Vonny Moyes, said more than 100 people were at Kilwinning train station.
Writing on Twitter she said: “More and more people are arriving from incoming trains not going any further.”
She added: “We've got no cash for the bus, and the nearest ATM is too far for four kids and all our luggage to walk.”
Half an hour later she said: “Buses have arrived so we can get to Paisley. Train to Glasgow, then Haymarket, then South Gyle. Hopefully train timetables correspond.”
National Rail Enquiries issued a statement about the disruption. It said: "A trespass incident at Milliken Park is causing delays of up to 30 minutes to trains between Paisley Gilmour Street and Kilwinning. This is expected to continue until 9:30pm."
A statement by Network Rail Scotland, which is responsible for the railway, said: "We're working with the emergency services and will reopen the line as soon as we can. Sorry if your journey is disrupted."
Train service provider Scotrail also apologised, adding: "Due to a problem on the line near Milliken Park, services running via this station are subject to disruption."
A spokeswoman for Police Scotland said: "We were called about an incident which happened shortly before 7pm. Officers from British Transport Police are leading on it."
British Transport Police could not be reached for comment.
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