AN investigations is under way after a cable theft in Glasgow forced trains to be cancelled and delayed.

The alarm was raised shortly after 9pm when Network Rail reported a signalling fault.
Engineers inspected the fault and found a large amount of cable was missing from Jordanhill Station.
Train services to and from Milngavie, Motherwell, Helensburgh Central, Dalmuir, Larkhall, Bellshill and Edinburgh were affected.
Fans of rock band The Who were left stranded after a concert at the SECC and ScotRail today apologised to them for the disruption. Normal service did not resume until this morning.
A spokeswoman for ScotRail said: “We apologise to customers for any inconvenience caused by circumstances beyond our control.”
It is the second time this week that vandals have caused major disruption.
Transport Police said trackside technology on the Barrhead line was “maliciously” damaged near Nitshill Station, sparking seven-hour delays and the cancellation of 25 trains on Tuesday.
Shortly before 6.30am, a maintenance engineer discovered wiring and two axle counters, which control access to the railways and let staff know where trains are travelling, had been tampered with, causing dozens of trains to be delayed or cancelled during the morning rush hour.
Commuters were hit with lengthy waits as they attempted to travel in the west of Scotland area, as a total of 45 trains were affected.
The vandalism affected services to Barrhead and Kilmarnock until around 1.30pm.
British Transport  Police are appealing for anyone with information to come forward.
Detective Constable Lorna White, the officer in charge, said: “For a second day trains were delayed and passenger journeys were disrupted due to vandalism.
“Anyone who has information is urged to contact BTP or Network Rail.”