14 hours each way
The G75 says 11 HRs. These stations are in the center of town with walk on service (takes me north of an hour to get to any airport in the states, plus another hour through security).
The flight from Orlando to Denver is certainly faster at closer to 5 HR (plus airport travel), as its a direct flight overland. But it's five hours in a tiny seat versus 11 hours in a sleeper car.
You're also moving far fewer people - between 140 and 230 two to three times a day - compared to the thousands of people you can move on an active train line round the clock.
Cross country weekend trip just isn’t practical
On what planet is a five hour flight each way practical for a weekend getaway?
The airline solution reduced comfort, increased individual costs, drastically increased pollution, and still didn't achieve the stated goal.