Given there are "many" such lines, as you claim, can you name one, please? Name one which "generates sufficient revenue to sustain operating costs".
In reality, there is no new line in TX, FL or the West Coast that has more than minimal ridership, and none come close to covering even a fraction of costs.
In fact, there is really only one commuter rail line in the U.S. outside of the NE Corridor and Chicago with any meaningful ridership- the Caltrain line between SF and SJ.
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