Watch: It's 75 years since NZ handed Nazi Germany its first land defeat of WWII.

Watch: It's 75 years since NZ handed Nazi Germany its first land defeat of WWII. Credit: Image - Historical Reenactment Society / Facebook, video - Newshub.

A man was horrified when his family outing at an Auckland tourist attraction was ruined by men dressed as "Nazis" and carrying guns.

The man, who didn't want to be identified, went with his wife and young children to Glenbrook Vintage Railway in south Auckland on Sunday.

"When we got there, we were shocked to see a number of people dressed in Nazi uniforms running around with guns... like they were doing war training of some sort," he told Newshub.

"When my wife said to one of the people in Nazi uniforms that they shouldn't be glorifying the Nazis, she was told 'it's history - if you don't like it piss off'."

He said there were about five men wearing the "Nazi" uniforms, and others wearing different uniforms.

"I find it horrific that these people don't seem to care that dressing as Nazis around trains and wagons is making light of the Holocaust."

The man said his children wanted to play on the playground, but once they saw the men with guns they became very frightened.

"They were laughing and making fun of my children, saying 'boo' and 'the bogey man's going to get you' after they had run back to us.

"If this is what they want to do on their own time on private property that's fine, but to basically have it pushed on your family is not cool at all."