RAIL passengers are being warned they may face travel chaos in the run up to two huge outdoor gigs.

Services between Glasgow Central and Paisley Canal are expected to be packed as music fans travel to Glasgow Summer Sessions at Bellahouston Park on Saturday and Sunday.

Scotrail said it was running extra trains and carriages but warned it would still be "extremely busy".

A queuing system will be in place at Dumbreck station - the closest station to the park – and there will be extra staff at key stations to assist customers.

From 10pm on Saturday, buses will replace trains between Glasgow Central and Paisley Canal, calling at all stations.

This will allow special train services to run between Dumbreck and Glasgow only, to get fans home after the music event, which is being headlined by Paolo Nutini and DJ Calvin Harris.

Ayrshire, Wemyss Bay and Gourock services are also expected to be very busy on Saturday.

A ScotRail spokeswoman also warned there are no trains between Paisley Canal and Glasgow Central after 6.35pm on Sundays so fans will have to make other plans to get home.

She said: “Services between Glasgow Central and Paisley Canal will be extremely busy this weekend due to Glasgow Summer Sessions.

“We will do all we can to get everyone to and from the music event, but are asking travellers to help us by setting off in good time. We also urge customers to buy their tickets in advance - not on the day.

“Passengers are reminded that there are no trains between Paisley Canal and Glasgow Central after 6.35pm on Sundays, so they will have to make other travel plans to get home from the concert on Sunday evening.”

Meanwhile, in the east of the country, services will also be very busy this weekend as thousands of rugby fans and festival-goers travel to and from Edinburgh.