$1k/ticket you can easily fly 1st class for that amount, usually less. I can't imagine making this type of trade off.
What in tarnation is up with American rail?? Picking random routes spanning the EU, I’m seeing things like a 15 hour sleeper journey costing €100 for a private sleeper cabin (or €16 for one bed in a shared 6-person cabin)
I believe that the US has terrible passenger rail, so it makes sense for things to be overly expensive, but in Europe this is a major problem too. One fair fix would be to start taxing flying more (e.g. fuel is untaxed right now) and actually give tax benefits to trains.