Qualla: Kaimai Tunnel https://qualla.com/kaimai-tunnel en-us © 2026 Bendyline Mon, 20 Jul 2026 10:21:28 GMT Qualla serial false Qualla support@bendyline.com yes https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/hero-small.webp Qualla: Kaimai Tunnel https://qualla.com/kaimai-tunnel Kaimai Tunnel: Introduction https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. Thirteen years. That is how long it took to punch nearly nine kilometers of tunnel through the Kaimai Range, a barrier of volcanic rock between the Waikato and the Bay of Plenty that had frustrated New Zealand's railway engineers since the early 1900s. When the Kaimai Tunnel finally opened on 12 September 1978, the Silver Fern railcar RM 3 glided through darkness that had cost decades of political wrangling, geological surprises, and one very expensive American boring machine. At 8.879 kilometers, it remains the longest railway tunnel in New Zealand -- a distinction it claimed from the Rimutaka Tunnel and has not relinquished since.

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-intro.mp3 0:06 1 full Kaimai Tunnel: The Old Way Through the Gorges https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. The route it replaced tells you everything about why the tunnel was needed. The East Coast Main Trunk Railway threaded through the Karangahake and Athenree gorges on grades as steep as 1:50, around curves with a radius of just six chains. Light rail limited the track to 55-pound-...

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-the-old-way-through-the-gorges.mp3 0:06 2 full Kaimai Tunnel: Half a Century of Arguments https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. By 1955, pressure from farmers and regional media had formed a Kaimai Tunnel Committee, pushing for a route that would include a four-kilometer tunnel connecting the Waikato to Mount Maunganui. The government studied it, then deferred. A 1958 report concluded there was not enough...

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-half-a-century-of-arguments.mp3 0:06 3 full Kaimai Tunnel: The Machine from America https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. On 2 October 1965, the Minister of Works broke ground on what was expected to be a five-year project. It would stretch to thirteen. The Ministry of Works handled the tunnel drilling, while private contractors built the approaches and laid track inside the bore. The real gamble ca...

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-the-machine-from-america.mp3 0:06 4 full Kaimai Tunnel: Through Ancient Stone https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. The geology the tunnel penetrated reads like a catalog of volcanic history: pumice, breccia, andesite, and ignimbrite interbedded with soft tuff, all of it between three and five million years old. This was not cooperative rock. Soft geology and groundwater created voids beneath ...

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-through-ancient-stone.mp3 0:06 5 full Kaimai Tunnel: The Shortcut That Changed Everything https://qualla.com/kaimai-tunnel/ Photo credit Archives New Zealand from New Zealand, CC BY-SA 2.0. When the Kaimai Deviation opened, it shortened the rail distance between Tauranga and Hamilton by 51.5 kilometers and the route between Rotorua and Tauranga by a full 100 kilometers. The ruling gradient eased from 1:50 to 1:300, allowing single engines to haul 900 tons instead of...

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Image: Archives New Zealand from New Zealand | CC BY-SA 2.0

]]> Mon, 09 Mar 2026 00:00:00 GMT https://qualla.com/_m/r/c/m/1/kaimai-tunnel-wp/rcm1-kaimai-tunnel-the-shortcut-that-changed-everything.mp3 0:06 6 full