Osaka to Tokyo on Shinkansen is ~500km and takes over 3 hours.
Los Angeles to Las Vegas on Amtrak is ~500km and takes over 7 hours.
Oh, except that you don't finish in Las Vegas. You finish in Kingman, AZ (more that 160km from Las Vegas) because that's as close as you can get with Amtrak.
The Shinkansen is travelling through significantly populated areas on the trip. Amtrak is travelling through a barren desert.
Los Angeles to Las Vegas on Amtrak is ~500km and takes over 7 hours.
Oh, except that you don't finish in Las Vegas. You finish in Kingman, AZ (more that 160km from Las Vegas) because that's as close as you can get with Amtrak.
The Shinkansen is travelling through significantly populated areas on the trip. Amtrak is travelling through a barren desert.