LIGHTNING caused minor delays to Joondalup line trains on Monday.
Public Transport Authority spokesman David Hynes said a lightning-related fault was identified on the line near Butler about 6.14am.
Mr Hynes said trains were delayed about 15 minutes.
‘This fault led to train signals being locked at red (as they are designed to do),’ he said.
He said safety rules mean drivers must stop at the signal and seek permission from Train Control staff to pass.
‘In this situation, they are limited to a maximum speed of 40km/h, which caused short delays,’ he said.
‘These issues were rectified by mid-morning, but most commuters would not have noticed any sustained delays.’
He said no trains stopped mid-route and the service was not suspended.