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King Hamad Causeway is a proposed causeway to connect Saudi Arabia and Bahrain, running parallel to the existing King Fahd Causeway. The causeway is expected to be about 25 kilometers and allow passenger trains, freight trains and vehicles so as to reduce the traffic on the King Fahd Causeway. It is estimated to cost $5 billion (3.9 billion euros) and will be a part of the proposed Gulf Railway.