The railroad tunnel beneath the St. Clair River has reopened to train traffic following a derailment late last month. According to CN, crews have finished laying track and the first train successfully cleared the international tunnel Tuesday afternoon. New track has been laid for the entire length of the tunnel and the sulphuric acid that spilled in the derailment has been removed. CN adds that they are working in full collaboration with the Canadian Transportation Safety Board who is leading the investigation into the June 28th derailment. 10th Street at the tunnel entrance has reopend to vehicle traffic however 16th Street remains closed for the time being.