Well, Bullet Train isn't a manga. It could be a novel adaptation or a completely original concept for a movie or something else. But in the realm of manga, it doesn't exist.
One common theme is character backstories. Writers often explore the pasts of the characters from the Bullet Train movie, like Ladybug's early days as an assassin. Another theme is alternative universes, where the events of the movie take a different turn, for example, if the characters had different allegiances.
Fanfiction.net is also a great place. There are many talented writers who contribute to the bullet train fanfiction there. However, the quality may vary, so you might need to read a few summaries or reviews before choosing a story.
I'm not sure specifically which 'bullet train novel' you are referring to. There could be many novels related to bullet trains. It might be about a story that takes place on a bullet train, perhaps involving mystery, adventure, or the lives of the passengers.
Bullet Train is not based on a true story. It's a work of imagination crafted by the writers to offer a thrilling and engaging narrative. The plot and characters are invented to captivate the audience.
Many Bullet Train Japanese novels often have a sense of speed and urgency, mirroring the nature of the bullet train itself. The plots can be fast - moving.
I think Pulp Fiction is better. It has a very distinct style that was revolutionary at the time. The dialogue is sharp and the characters are so vivid. Travolta and Jackson's performances are iconic. Bullet Train is a fun action movie, but it lacks the depth and cultural significance that Pulp Fiction has.