[1] 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.

[2] It is estimated to cost $5 billion and will be a part of the proposed Gulf Railway.

[3] The causeway was first proposed during a meeting between King Hamad bin Isa Al Khalifa of Bahrain and King Abdullah bin Abdulaziz of Saudi Arabia in September 2014 in Jeddah.

[4] SNC Lavalin was appointed to undertake a feasibility study for the project.

[5] During a state visit by King Salman bin Abdulaziz to Bahrain in December 2016, the two countries signed an agreement to implement the project.