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A train driver who was caught sending depraved sexual messages to a '12-year-old girl' in an online sting is facing jail.
Stuart Clelland, 57, was snared by vigilantes after he began talking to a decoy account on messaging app Tagged.
He was unaware the 'girl' was a woman pretending to be a youngster as part of a group to weed out predators.
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Clelland made vile innuendos through hours of chats but was confronted by a group at his house before being arrested.
He quit his role with Scotrail after footage of the sting went viral on the internet.
Clelland, of Airdrie, Lanarkshire , denied any wrongdoing and went on trial at Hamilton Sheriff Court.
But a jury convicted him of making sexual communications with the g