The Government announced earlier this month that services to the East End along the new tram extension would begin this Sunday.
But signalling issues, identified during driver training, have forced the Government to delay launching the service.
Contractors are flying back from Germany to help fix the problem.
“This is a very frustrating development in this problem-plagued project,” Transport Minister Stephan Knoll said.
“This project has been riddled with problems from the outset and the State Government would like to apologise to South Australians for the inconvenience, uncertainty and delays this project has caused over the past 12 months.
“Testing is underway to identify the exact fault, which will ned to be rectified before passenger services are able to commence safely.”
He said contractors from Hanning and Kahl were flying from Germany to help fix the issue.
“Every effort is being made to fix this problem and get passenger services up and running as soon as possible,” said Knoll.
“These latest issues will also be captured by the State Government’s review of this project once complete.”
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