Right on the border between Belgium and Luxembourg, the Huldange tunnel was inaugurated in 1889, the last hurdle for goods trains running on the Vennbahn.
In the early twentieth century, a tunnel more than 140 meters long was excavated right through the rock on which the castle ruins of the Counts of Dalhem rest to construct local tramway line 466 between Liège and 's-Gravenvelden.
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In the early nineteenth century, the industrial revolution swept across continental Europe and one steelworks after another rose from the ground. Europe had hundreds of blast furnaces, but since the mid-twentieth century, Europe's steel industry has been slowly going downhill.
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