Steve Montgomery from First ScotRail and Ron McAulay and David Simpson from Network Rail.

BBC: Transport, Infrastructure and Climate Committee

First ScotRail's maintenance staff is then advised there's a problem with a particular door on a particular train.

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Ochil's SNP MSP Keith Brown said he had written to First Scotrail calling on the company to install a ticketing machine.

BBC: Ticketing woes for new Alloa line

The engineers are hoping to spot nascent mechanical problems on long-distance train lines run by First ScotRail, a Scottish train operator.

FORBES: Magazine Article

Train operators including Virgin Trains and East Coast - which link London and Scotland - Arriva Trains Wales, Cross Country, First TransPennine Express, Northern and Scotrail were all reporting disruption.

BBC: Snow and ice leads to travel delays and school closures

Chiltern Railways, First Great Western, London Midland, Scotrail, Stansted Express and Virgin Trains are all subject to cancellations and alterations.

BBC: Motorists rescued from heavy snow