The train, allegedly laden with stolen gold and other treasures, is believed to have been hidden by the Nazis during the World War II near the modern Polish city of Wałbrzych. The search group began excavations using heavy equipment at the search site on Tuesday morning.
"We need to find the track and the entrance to the railway tunnel. If there is one, it is likely to have the train in it," spokesman for the search group Andrzej Gaik said, as quoted by Polish television TVN24.
He also noted that representatives of various companies, who operated at the search site, examined the terrain using ground penetrating radars, and their results were "very promising."
"They pointed to anomalies that indicate the existence of the tunnel. Everything points to the fact that there is something there inside," the representative of the search team explained.
According to Gaik, the excavations are carried out in a few places. After the searchers went down to a depth of 4.5 meters and stumbled upon a stone rock, they had to try another area 15 meters away from one of the sites.