Japan > England >> USA. Just being able to take the TGV from London to Paris is mindblowing.
I define great as it being generally possible to get where I want to go on the train (this is the most important factor) and then as a bonus it's usually competitive with driving, busing, flying, cycling, or walking in terms of comfort, cost, and convenience.
I define great as it being generally possible to get where I want to go on the train (this is the most important factor) and then as a bonus it's usually competitive with driving, busing, flying, cycling, or walking in terms of comfort, cost, and convenience.