KiwiRail says it cannot guarantee there will not be more problems on the Wellington rail network. There have been three breakdowns this week to date.
Four early services on Wednesday morning were cancelled because trains were in the wrong place after the latest fault was fixed. KiwiRail says no other trains should be affected.
Trains at Wellington Railway Station ground to a halt on Tuesday after an electrical fault in overhead wiring, leaving hundreds of commuters stranded from about 6pm.
On Monday morning, 2000 passengers had to get off their trains and switch to buses after electrical problems halted 10 trains.
There were more problems for commuters on Monday evening, with delays on the Hutt Valley and Paraparaumu lines.
Earlier this week, KiwiRail warned that passengers could expect delays and replacement buses while it works on lines as part of a $550 million upgrade of the service. The upgrade is 60% complete.
KiwiRail says all it can do is to arrange alternative transport if more problems occur. It says the priority is making sure the network remains stable, not compensation.