I’m not sure it’s commonly known that the grand 1994 actioner “Speed” is actually something of a remake, taking its concept and sense of urgency from 1975’s “The Bullet Train,” which first presented the idea of a bomb threat on a moving vehicle that can’t slow down. And now there’s “Bullet Train Explosion,” another reworking of “The Bullet Train,” reviving the central crisis while also striving to be a sequel to the original offering. Director Shinji Higuchi moves from giant threats in “Shin Godzilla” and “Shin Ultraman” to a speedier level of danger, overseeing the disaster movie elements of “Bullet Train Explosion,” which endeavors to become an epic study of survival and shame. It’s a long journey (137 minutes), and the picture doesn’t earn that run time, but Higuchi has some clarity when it comes to near-misses and assorted beats of suspense. Read the rest at Blu-ray.com