The Greens say the problems dogging Te Huia shouldn't stop us from expanding the regional rail network.

The Transport and Infrastructure Select Committee is taking public submissions, as part of an inquiry into the country's passenger rail network.

Newstalk ZB has revealed Te Huia, the recently launched Hamilton to Auckland rail service, has been plagued with low passenger numbers and other issues.

But Greens Transport spokesperson Julie Ann-Genter told Mike Hosking future services will be faster and more frequent.

She does it's too early to judge Te Huia as it takes time for people to plan their lives around a new service.

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