The use of numbers instead of letters (leetspeak) like "bull3t.tr41n" is a common tactic used by uploaders to bypass automated copyright filters on hosting sites and search engines. Context of this File Name : Bullet Train (2022), starring Brad Pitt.
: Downloading or streaming from these sources is illegal in many jurisdictions and violates intellectual property rights. Official Ways to Watch
If you encountered this name in a blog post, it is likely a "leech" or "warez" site. Be cautious, as these links often lead to: