Local media have for days been abuzz with old lore of trains full of gold and jewels stolen by the Nazis after two men -- a German and a Pole -- claimed to have found an armoured train car in the southwestern city of Walbrzych.
"I'm more than 99 percent sure such a train exists, but the nature of its contents is unverifiable at the moment," Deputy Culture Minister Piotr Zuchowski told reporters.
Zuchowski, who is also the national heritage conservation officer, refused to reveal the train's exact location, adding: "My understanding is that no one has accessed it since the (Second World) War."
Someone, who decades ago took part in hiding the train that is over 100 metres (330 feet) in length, passed along the information by word of mouth, Zuchowski said but did not specify to whom.
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"And this person shared the information on their deathbed along with a sketch of where it could be found," he said without revealing the person's identity.
"The fact that this train is armoured suggests there could be valuable objects inside" including artwork, archival documents or treasures, he said.
But he warned that the train could also be booby-trapped.