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You are correct transatlantic ET3 (tm) will be expensive, however more than 95% of the ET3 network will operate at 200mph to 600mph design speed, and across land -- not water. Only if ET3 networks are built to the same standard in every country can they eventually be networked together with a global backbone operating at 4k mph. This will only cross less than 100 miles of ocean (between Alaska and Siberia).