Question: is the movie split part of a trilogy

Answer: Yes, The Unbreakable film series, also referred to as the Eastrail 177 Trilogy, is an American thriller, psychological horror, and superhero film series involving the derailment of the fictitious Eastrail #177 train. The films were written, produced, and directed by M. Night Shyamalan. The trilogy consists of Unbreakable (2000), Split (2016), and Glass (2019).