Severe weekend weather has caused a landslide in the Adelaide Hills resulting in significant delays to city-bound trains.

Hundreds of commuters were left stranded after both Belair and Gawler line trains were grounded due to weather conditions and mechanical issues.

An Adelaide Metro spokeswoman said overnight wind and rain had directly impacted the Belair rail line, with crews forced to work overnight to try and clear the wreckage.

“The weekend’s exceptionally wet weather caused mud and debris to be washed onto the Belair rail line between Belair and Pinera last night,” she said.

“Crews worked overnight to clear the debris and ensure the line could remain operational.

“As a precaution, trains have been travelling at reduced speeds this morning due to excess water on sections of the line. As a result, Belair line services are currently experiencing delays of up to 20 minutes in both directions.”

The Advertiser understands a landslide, as a result of Sunday’s weather, is the cause of the delays.

Adelaide Metro advised passengers to “allow for extra travel time”.

It also issued a statement on Monday saying two Gawler train services had been cancelled, and that replacement services would stop at every station to “accommodate passengers”.