Passengers on ScotRail trains travelling to and from Glasgow are venting their frustrations on Twitter today after further delays and rail cancellations.

Delays are expected to continue until at least 3pm this afternoon (Saturday), and customers are far from happy.

Euan Waddler said.

Lynne Clark tweeted. 

Passengers have complained about over-crowding on trains to Glasgow, with seating unavailable even after reserving seats online.

ScotRail recently tweeted that trains will now be leaving Glasgow Queen Street on the hour and on the half hour.

With many trains cancelled or delayed for more than an hour, passengers are finding themselves without seats, or even trains, as ScotRail have been forced to offer passengers replacement First Bus services between the Glasgow Queen St and Edinburgh line.

Read MoreDelays and cancellations add further woe to frustrated ScotRail passengers.

For the latest info on delays and cancellations check ScotRail's Twitter feed.