Your comment gives the impression that Amtrak has no business operating on the tracks they do.
The reason the freight companies own those rails is primarily from the land grants made my the federal government which came with obligations, such as providing passenger service. Amtrak has trackage rights because the freight companies wanted to divest their passenger rail operations. Maybe an unwelcome guest, but essentially a former part of their own operations.
Anyhow, buses are an insufficient substitute for passenger trains and already available from other operators. If they were sufficient people wouldn't be on the trains.
The reason the freight companies own those rails is primarily from the land grants made my the federal government which came with obligations, such as providing passenger service. Amtrak has trackage rights because the freight companies wanted to divest their passenger rail operations. Maybe an unwelcome guest, but essentially a former part of their own operations.
Anyhow, buses are an insufficient substitute for passenger trains and already available from other operators. If they were sufficient people wouldn't be on the trains.