What is the difference between Vade Bharat, Bullet Train and now Namo Bharat?

Now both the picture and fate of Indian Railways have changed. There was a time when Indian Railways was infamous all over the world. But this is no longer the case. Everything has changed with the advent of Vande Bharat, Bullet Train and now Namo Bharat Rapid Rail. Apart from these high-speed trains, there has also been a change in the infrastructure of stations, world class facilities, security of passengers. Let us know, what is the difference and special thing between Vade Bharat, Bullet Train and now Namo Bharat Rapid Rail.