WorkSafe said it was working with the railway operator to help navigate the licence approval process.
“We expect this process to be completed within the next fortnight.”
Keirunga Park Railway Incorporated said on its website that members would continue to perform maintenance on the track during the closure.
“We apologise for the inconvenience to all of our train enthusiasts, but we hope to see you soon riding the trains at Keirunga Park Railway,” a statement read.
“Currently, the trains are sleeping soundly in their cosy sheds.”
The 846m-long railway opened in 1992, with a track that winds around Keirunga Gardens, through tunnels, over viaducts and around scenic rock faces.
It is rated in the top-five miniature railway tracks in New Zealand.
Keirunga Park Railway Incorporated was approached for comment.