The people in the meme are at about Seattle and NYC, which is a little over 3k miles apart (by car). You’d need to be going 250mph for the entire 12 hours to make that distance. A quick google search says that the maximum operating speed of a bullet train is 200mph, but tests have been conducted at 275mph.
So, you’d need to go non-stop at 125% max speed to make the trip in 12 hours. Even if you went at 275mph, realistically you’d make a lot of stops along the way, which is going to make the average speed a lot lower. Trains are great, but the US is really big.
Bonus fact: a non-stop flight from Seattle to NYC takes about 5.5 hours.