The Overboelare tunnel is a railway tunnel in Overboelare, a town of Geraardsbergen. The tunnel has a length of 401 meters. Line 123 goes through this tunnel. The railway line is double-sided on both sides of the tunnel. By 2016, the original tunnel in the tunnel was replaced by a single lane with interchanges on the entrance and exit of the tunnel. Due to the modernization of rail infrastructure in the summer of 2016, the train can drive 90 km / h through the tunnel (previously 40 km / h).
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