Rail union RMT has announced seven days of strikes during June and July in a dispute over driver-only trains at ScotRail.

One of the strikes will take place on the day of the EU referendum on June 23, with an overtime ban in place on several other dates.

The union is opposed to the extension of driver-only and driver-controlled services during the lifetime of the current Abellio ScotRail franchise.

It says it has not received assurances it sought on the issue from the operator.

Strikes will take place on Tuesday, June 21, Thursday, June 23 and the weekend of June 25 and 26.

In July, there will be strikes on Sunday, July 3, Sunday, July 10 and Sunday, July 17.

The overtime ban will be in place on Wednesday, June 22, Friday, June 24, and the first three weekends of July.

Union members had voted by 3 to 1 in favour of strikes over the issue of driver-only operation (DOO).

RMT general secretary Mick Cash said: "It is extraordinary that Abellio Scotrail continue to ignore the strength of feeling amongst their staff over the extension of DOO and that they are still trying to bypass the normal negotiating machinery.

"That disgraceful and cavalier approach to jobs and safety on Scotland's railways now leaves us with no choice but to move to a campaign of industrial action.

"Our members on Scotrail stand determined and united in this fight for jobs and safety on Scotland's rail services.

"They have not been fooled by the company dirty tricks and their attempt to influence and distort a democratic, secret ballot of the staff has backfired spectacularly with 75% voting for strike action on a 75% turnout - busting through the thresholds of even the most rabid, anti-union sections of the hard right." ‎

He added: "The workforce know that any extension of DOO or DCO is a clear attack on our members hard earned terms and conditions.

"RMT members should not have to face the risk of their role and responsibilities being reduced and undermined.

"The workforce also know only too well that there is a very real threat to passengers of watering down and wiping out the safety critical role of the guard on these Scotrail services. ‎That is a lethal gamble with basic rail safety.

"The union remains available for serious and meaningful talks but the ball is now firmly in ScotRail's court."

ScotRail has previously said it has no plans to extend the number of driver-only services

A ScotRail spokesman said on Tuesday: "We believe that the solution to this dispute lies in talks, not strikes.

"We look forward to getting round the table again for continued talks with RMT tomorrow."