Denzel Washington thinks comic book-adaptation movies are "on steroids".

The Hollywood star believes comic movies such as 'Spider-Man' and 'Iron Man' have managed to recapture the spirit of a by-gone era thanks to the technology which can now be used on such projects.

He said: "I think that comic book movies now is what comic books were 40 years ago. That same adventure, that same thrill.

"I had a buddy of mine who had this big collection of comic books and he lived in that world man! Now I think with the technology we can do comic books on steroids."

Discussing his current movie 'Unstoppable' - in which he stars a railway worker who must stop a forthcoming runaway train - Denzel jokes he and director Tony Scott don't have to do much work because the train does the work for them.

He told Collider.com: "You got this big monster train, that's going to do all the work for him! You don't have to shake the camera too much."