ScotRail has warned of extra pressure on services due to a driver shortage, Christmas shopping and football traffic.

Network Rail is experiencing a nationwide fault with the radio system between driver and signallers.

Like much of the rail industry, ScotRail has not had enough drivers to staff its services for years now.

A reduced service has been running since July but the normal schedule will resume after a pay dispute was resolved.

Trains have been running on a reduced timetable since 10 July following a pay dispute with drivers.

Tickets bought on certain services will now return to higher prices.

The rail operator is still working on how to reintroduce a full timetable after the resolution of a pay row.

The government says the scheme was not worth the cost as it has not persuaded people to turn to rail.