SPT is committed to longer opening hours for the Subway once new trains and signalling are in place, its chief executive has said.

The matter was raised with a panel of transport experts and officials at a fringe event at the SNP annual conference in Aberdeen, organised by Strathclyde Partnership for Transport.

Sandra White, former Glasgow SNP MSP, had asked about extending the Subway hours at night and on Sundays when it closes at 6pm.

She asked: “Why can’t it operate at times when people want to use it?”

She added: “We have a system. Why can’t we use it to its full ability?”

Ms Davidson said: “SPT is committed to longer hours for the Subway. We are testing trains at night at the moment.

She said new trains and signalling “opens up the pathway” to longer hours.

Ms Davidson also said an Oyster style card for use on all bus, train and Subway journeys in Glasgow is possible but there are too many commercial operators.

There have been repeated calls for a ticket, paid for upfront that, can be used on all forms of public transport, capping daily or weekly journeys, similar to the Oyster card in London.

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Ms Davidson said it is possible, the technology already exists and is being used in other places, like Edinburgh.

She said: “Technology is not the issue. The issue is to do with splitting the pot of fares.”

Ms Davidson said there would be 40 to 45 bus operators across the Strathclyde region involved and each would require to be compensated for their share of trips.

She added: “That is difficult”.

Ms Davidson also said SPT was committed to increasing the opening hours of the Subway.