There's a birthday celebration for a vital piece of infrastructure which dates back to the days of Sir Robert Muldoon.
The Kaimai Rail Tunnel linking the eastern Waikato to the Bay of Plenty is 40 years old today.
And back in the 1970s it was as big a deal, construction-wise, as the rail corridor currently being built under central Auckland.
Reporter Michael Holland has the full story for TVNZ1's Seven Sharp in the video above.
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