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Re:French lawmakers approve a ban on short domestic flights by closeparen on Sunday April 11, 2021 @04:41PM (#26773217)
Tying up capital equipment and personnel for much less time to serve the same journey. Consider San Francisco to Chicago, a route I have done both ways. The flight is 5 hours, the train ride 50 hours. A 737 is more expensive than the California Zephyr trainset, but not by 10x.

I'm not sure what noise has to do with efficiency - I doubt that the energy expended on vibrating the air is physically or economically significant - but it is worth noting that trains are loud. Particularly because regulations written in blood require that they blow their horns three times at every level crossing at all hours.

Re:French lawmakers approve a ban on short domestic flights by Symbiote on Tuesday April 13, 2021 @03:55AM (#26789354)
(Among developed countries I'm familiar with) it's only the USA that has the excessively loud train horns at level crossings, and a lot of crossings. In Europe, lights, bells (or a beeper thing) and automatic barriers are used instead, sometimes with automatic or manual infrared/visible cameras to confirm the crossing is clear of road vehicles.