What is the best way to travel from NY to Vegas but not via airplane or driving?

Trying to help a friend travel from NY to Vegas but he cannot fly or drive. Does anyone know if there's a good train or bus system that would get him there efficiently?What is the best way to travel from NY to Vegas but not via airplane or driving?Your options are pretty limited. Check out Amtrak and Greyhound.What is the best way to travel from NY to Vegas but not via airplane or driving?Take BUS - Greyhound bus for example.What is the best way to travel from NY to Vegas but not via airplane or driving?Just Greyhound, but it will take a long time to get there.