Just as commuters had managed to get through engineering works and disruption through April, ScotRail has announced more disruption and timetable changes. This time, they’re set to last for more than three months, almost double in some cases.

The national rail provider described how it is “progressing plans to transform Scotland’s railway, bringing more seats and faster journeys.”

It added: “To make this happen, work to upgrade Scotland’s railway is underway across the network. This means more timetable changes from 21 May 2017.”

READ MORE: ‘We are one of the best train providers in Britain and among top in Europe,’ says ScotRail

The following routes are set to be affected from the end of May until either September or December:

Glasgow - Alloa / Stirling / Dunblane / Perth

On Sunday to Thursday evenings after 8pm, until September 10, trains look set to be either diverted or cancelled. Replacement buses will operate when there are no trains running.

The last trains of the day heading north may depart earlier than usual.

Glasgow Queen Street - Dundee / Aberdeen / Inverness

On Sunday to Thursday evenings after 8pm, until September 10, services may be diverted via Polmont or cancelled. Again, replacement buses operate when there are no trains running.

Also as above, the last trains of the day heading north may depart earlier than usual.

The Herald:
The services which are set to be disrupted from May 21 (Credit: ScotRail)

Glasgow Queen Street - Falkirk Grahamston

On Monday to Thursday evenings after 8pm, until September 7, trains may be cancelled.

Trains between Glasgow Queen Street low level and Cumbernauld will run as normal with replacement buses operating between Cumbernauld and Falkirk Grahamston.

Glasgow Central - Edinburgh via Shotts

All day Sunday and Monday to Thursday evenings after 8pm, until December 7, trains may be cancelled or operate between West Calder - Edinburgh only at certain times of the day. Replacement buses will run when there are no trains running.

READ MORE: ScotRail under fire as complaints about service rise

“You can also use Lanark trains, which run as normal, between Glasgow Central - Bellshill in both directions,” ScotRail added.

To make sure journeys run as smoothly as possible, ScotRail has reminded passengers: “If your journey includes a replacement bus, please allow more time to reach your destination.

“Check your journey. Bus departure times may not match normal train times. Please use our app or website to plan your travel.”

For more in-depth information, and to check timetables, click here.