COMMUTERS have been warned to expect disruption on busy rush-hour rail services from Helensburgh, Balloch and Dumbarton towards Glasgow on Wednesday morning.

ScotRail says the disruption is being caused by a broken down train at its Yoker depot.

Delays and cancellations can be expected on the Helensburgh-Edinburgh, Balloch-Airdrie, Dumbarton-Springburn and Dalmuir-Whifflet/Motherwell-Larkhall lines.

According to ScotRail, disruption is expected until 8am.

It's the latest episode in another week of disruption to ScotRail's services on the busy commuter lines north-west of Glasgow.

READ MORE: Train cancellations add to commuters' winter travel woes

On Tuesday, a broken down train in Edinburgh caused knock-on disruption to numerous services on the Helensburgh Central route - adding to disruption caused by heavy morning snow showers.

In addition, ScotRail says that several trains on the above routes will be operated with three-coach trains instead of six on Wednesday.

The following services will run with half the usual number of coaches:

0646 Airdrie-Balloch

0648 Edinburgh-Helensburgh

0807 Balloch-Airdrie

0854 Helensburgh-Edinburgh

0946 Airdrie-Balloch

1107 Balloch-Airdrie

1246 Airdrie-Balloch

1407 Balloch-Airdrie

1449 Edinburgh-Helensburgh

1546 Airdrie-Balloch

1654 Helensburgh-Edinburgh

1707 Balloch-Airdrie

1846 Airdrie-Balloch

2014 Balloch-Springburn