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Just weeks out from the opening of the southwest metro line, complex negotiations with the safety regulator have forced major operational changes.

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A number of the carriage doors will be unusable at key stations as testing continues on the already delayed multi-billion dollar project.

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Dulwich Hill Station retrofitted yet still not fit for purpose.

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and as passengers await the Metro's opening tonight they've been told when they do finally board it won't be through all doors.

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We've agreed with the National Rail regulator that six of those doors will stay closed so that there's no even minor safety issues.

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A curveball due to curved platforms automated gap fillers not yet filling the regulator with confidence in the wider spots.

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At Dulwich Hill it means a whole carriage could be shuttered. Oh, that's a bit of a shock.

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How are you going to get out? Somebody hasn't done enough testing or measuring. How did it go wrong?

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Well, I don't accept that it's gone wrong. Well, the doors can't open. I don't accept that it's gone wrong.

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Dulwich Hill is the worst of four stations impacted.

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At Campsy, Canterbury and Marrickville, one set of doors each will remain closed.

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They'll be clearly signed so passengers know. What a monumental stuff up. The minister's known about this issue for a year.

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He's been back and forth with the safety regulator and still hopes that eventually all doors will be in use.

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Commuters are being put at the back of the priorities of this government.

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A mid-October opening was the aim that's now under question.

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As soon as I've got a date recommended to me, we will be clear with the public what that date is. So you've got to be savvy. Yeah, I can handle that.

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Training doors opening. Unlikely all will be quiet as accommodating. Liz Daniels, Nine News.

Why Metro doors won't open at some new Sydney stations | 9 News Australia