A three-month trial to deploy two British Transport Police officers on day-to-day policing duties on the network began in January.

Officers dealt with a range of activities including offering crime prevention advice and public safety.

They were also involved in crowd control at extremely busy times, including match days.

Strathclyde Partnership for Transport (SPT), which operates the network, said the move to make patrols a permanent feature would be a major boost for passenger safety.

Donnie Macleod, SPT head of security, said: "Passenger safety remains our top priority.

This agreement was reached through working closely with British Transport Police as well as Strathclyde Police and SPT places a high value on these links Donnie Macleod SPT head of security

"Often the fear of crime is much greater than the actual reality so by having officers policing the system on a daily basis, we are providing visible and effective reassurance to our passengers.

"This agreement was reached through working closely with British Transport Police as well as Strathclyde Police and SPT places a high value on these links."

Superintendent Ronnie Mellis, area commander for the British Transport Police in Scotland, said the trial period had been a huge success.

He added: "British Transport Police is experienced at policing this environment and our officers bring a wealth of skills and experience to the Glasgow Subway.

"BTP will not tolerate crime and disorder on the rail network and we will continue to work closely with SPT and colleagues from Strathclyde Police to ensure the safety of staff and passengers."